Journal ArticleAbdom Radiol (NY) · August 2022
PURPOSE: To compare clinical efficacy, subjective radiologist preference, and complication rates for two different core biopsy needles, the Achieve® and Marquee®. METHODS: Retrospective review included consecutive patients who underwent 18 gauge non-target ...
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Journal ArticleAJR Am J Roentgenol · April 2022
BACKGROUND. CT-based criteria for assessing the gastrointestinal stromal tumor (GIST) response to tyrosine kinase inhibitor (TKI) therapy are limited in part because tumor attenuation is influenced by treatment-related changes including hemorrhage and calc ...
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Journal ArticleMol Cancer Ther · January 2022
A noninvasive test to discriminate indolent prostate cancers from lethal ones would focus treatment where necessary while reducing overtreatment. We exploited the known activity of heat shock protein 90 (Hsp90) as a chaperone critical for the function of n ...
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Journal ArticleUltrasound Med Biol · January 2022
Ultrasound is an essential tool for diagnosing and monitoring diseases, but it can be limited by poor image quality. Lag-one coherence (LOC) is an image quality metric that can be related to signal-to-noise ratio and contrast-to-noise ratio. In this study, ...
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Journal ArticleAbdom Radiol (NY) · June 2021
PURPOSE: CT angiography (CTA) requires vascular access with flow rates of 5-7 mL/s. Hemodialysis (HD) is performed at 6-10 mL/s. The purpose of our study is to evaluate the structural integrity of HD catheters in the administration of contrast media via a ...
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Journal ArticleAbdom Radiol (NY) · March 2021
OBJECTIVE: To determine the rate of development of clinically significant liver nodules (LR-4, LR-5, LR-M) after a negative MRI in an HCC screening population. METHODS: This retrospective study included patients at risk of developing HCC requiring imaging ...
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Journal ArticleClin Imaging · May 2020
PURPOSE: To compare the efficacy of two 18-gauge core needle biopsy systems, the Achieve® (Merit Medical) and the Marquee® (BD Bard), using an ex-vivo animal liver model and retrospective review of clinical experience. METHODS: Sixty ex-vivo liver biopsy s ...
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Journal ArticleEur Radiol · April 2019
OBJECTIVES: To assess the impact of scan- and patient-related factors on the error and the minimum detectable difference in iodine concentration among different generations of single-source (SS) fast kV-switching and dual-source (DS) dual-energy CT (DECT). ...
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Journal ArticleCurr Probl Diagn Radiol · 2019
OBJECTIVE: When objectively measured on computed tomography (CT), does hepatic heterogeneity or overall liver attenuation predict the presence of shock? METHODS: This retrospective study included 73 patients (mean age 33 years) with the hypoperfusion shock ...
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Journal ArticleRadiat Prot Dosimetry · December 1, 2018
The purpose of this study was to validate a novel approach to estimating effective dose (E) in 'fast-kV switch dual energy computed tomography' using MOSFET detectors. The effective energy of the combined dual energy environment was characterized with the ...
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Journal ArticleAbdom Radiol (NY) · September 2018
OBJECTIVE: The objective of the article is to assess changes in splenic volume in the setting of hypovolemic shock; splenic enhancement in hypovolemic shock is also assessed. MATERIALS/METHODS: 71 consecutive adult patients with the hypovolemic shock compl ...
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Journal ArticleAJR Am J Roentgenol · September 2018
OBJECTIVE: The objective of this study is to determine whether single-phase contrast-enhanced dual-energy CT (DECT) material attenuation analysis improves the characterization of small (< 2.0 cm) incidental indeterminate hypoattenuating hepatic lesions, co ...
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Journal ArticleRadiology · June 2018
Purpose To investigate the relationship between energy level of virtual monoenergetic (VM) imaging and sensitivity in the detection of minimally enhancing renal lesions. Materials and Methods Phantoms simulating unenhanced and contrast material-enhanced re ...
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Journal ArticleAJR Am J Roentgenol · June 2018
OBJECTIVE: The purpose of this study was to assess image noise, spatial resolution, lesion detectability, and the dose reduction potential of a proprietary third-generation adaptive statistical iterative reconstruction (ASIR-V) technique. MATERIALS AND MET ...
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Journal ArticleJ Am Coll Radiol · January 2017
PURPOSE: To determine the value of image-rich radiology reports (IRRR) by evaluating the interest and preferences of referring physicians, potential impact on clinical workflow, and the willingness of radiologists to create them. METHODS: Referring physici ...
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Journal ArticleAJR Am J Roentgenol · August 2016
OBJECTIVE: The purpose of this study was to prospectively investigate the clinical feasibility of adopting splenic enhancement for timing and triggering the acquisition of late hepatic arterial phase images during multiphasic liver MDCT for assessment of h ...
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Journal ArticleJ Magn Reson Imaging · June 2016
PURPOSE: To determine whether reader perception of a capsule affects reader interpretation of washout in hypervascular liver nodules at dynamic magnetic resonance imaging (MRI) in patients at risk for hepatocellular carcinoma (HCC). MATERIALS AND METHODS: ...
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Journal ArticleAJR Am J Roentgenol · June 2016
OBJECTIVE: The purpose of this study is to investigate whether the reduction in noise using a second-generation monoenergetic algorithm can improve the conspicuity of hypervascular liver tumors on dual-energy CT (DECT) images of the liver. MATERIALS AND ME ...
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Journal ArticleJ Magn Reson Imaging · May 2016
PURPOSE: To determine whether triple-arterial phase acquisition with fluoroscopic triggering can provide both well-timed early and late hepatic arterial phase (HAP) images more frequently than when using a fixed-time delay during gadoxetic acid-enhanced ma ...
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Journal ArticleRadiology · April 2016
PURPOSE: To determine the variance in virtual monochromatic computed tomography (CT) numbers from the same lesion, comparing the two clinically available dual-energy multidetector CT hardware implementations (single-source projection-based and dual-source ...
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Journal ArticleAbdom Radiol (NY) · August 2022
PURPOSE: To compare clinical efficacy, subjective radiologist preference, and complication rates for two different core biopsy needles, the Achieve® and Marquee®. METHODS: Retrospective review included consecutive patients who underwent 18 gauge non-target ...
Full textLink to itemCite
Journal ArticleAJR Am J Roentgenol · April 2022
BACKGROUND. CT-based criteria for assessing the gastrointestinal stromal tumor (GIST) response to tyrosine kinase inhibitor (TKI) therapy are limited in part because tumor attenuation is influenced by treatment-related changes including hemorrhage and calc ...
Full textLink to itemCite
Journal ArticleMol Cancer Ther · January 2022
A noninvasive test to discriminate indolent prostate cancers from lethal ones would focus treatment where necessary while reducing overtreatment. We exploited the known activity of heat shock protein 90 (Hsp90) as a chaperone critical for the function of n ...
Full textLink to itemCite
Journal ArticleUltrasound Med Biol · January 2022
Ultrasound is an essential tool for diagnosing and monitoring diseases, but it can be limited by poor image quality. Lag-one coherence (LOC) is an image quality metric that can be related to signal-to-noise ratio and contrast-to-noise ratio. In this study, ...
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Journal ArticleAbdom Radiol (NY) · June 2021
PURPOSE: CT angiography (CTA) requires vascular access with flow rates of 5-7 mL/s. Hemodialysis (HD) is performed at 6-10 mL/s. The purpose of our study is to evaluate the structural integrity of HD catheters in the administration of contrast media via a ...
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Journal ArticleAbdom Radiol (NY) · March 2021
OBJECTIVE: To determine the rate of development of clinically significant liver nodules (LR-4, LR-5, LR-M) after a negative MRI in an HCC screening population. METHODS: This retrospective study included patients at risk of developing HCC requiring imaging ...
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Journal ArticleClin Imaging · May 2020
PURPOSE: To compare the efficacy of two 18-gauge core needle biopsy systems, the Achieve® (Merit Medical) and the Marquee® (BD Bard), using an ex-vivo animal liver model and retrospective review of clinical experience. METHODS: Sixty ex-vivo liver biopsy s ...
Full textLink to itemCite
Journal ArticleEur Radiol · April 2019
OBJECTIVES: To assess the impact of scan- and patient-related factors on the error and the minimum detectable difference in iodine concentration among different generations of single-source (SS) fast kV-switching and dual-source (DS) dual-energy CT (DECT). ...
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Journal ArticleCurr Probl Diagn Radiol · 2019
OBJECTIVE: When objectively measured on computed tomography (CT), does hepatic heterogeneity or overall liver attenuation predict the presence of shock? METHODS: This retrospective study included 73 patients (mean age 33 years) with the hypoperfusion shock ...
Full textLink to itemCite
Journal ArticleRadiat Prot Dosimetry · December 1, 2018
The purpose of this study was to validate a novel approach to estimating effective dose (E) in 'fast-kV switch dual energy computed tomography' using MOSFET detectors. The effective energy of the combined dual energy environment was characterized with the ...
Full textLink to itemCite
Journal ArticleAbdom Radiol (NY) · September 2018
OBJECTIVE: The objective of the article is to assess changes in splenic volume in the setting of hypovolemic shock; splenic enhancement in hypovolemic shock is also assessed. MATERIALS/METHODS: 71 consecutive adult patients with the hypovolemic shock compl ...
Full textLink to itemCite
Journal ArticleAJR Am J Roentgenol · September 2018
OBJECTIVE: The objective of this study is to determine whether single-phase contrast-enhanced dual-energy CT (DECT) material attenuation analysis improves the characterization of small (< 2.0 cm) incidental indeterminate hypoattenuating hepatic lesions, co ...
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Journal ArticleRadiology · June 2018
Purpose To investigate the relationship between energy level of virtual monoenergetic (VM) imaging and sensitivity in the detection of minimally enhancing renal lesions. Materials and Methods Phantoms simulating unenhanced and contrast material-enhanced re ...
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Journal ArticleAJR Am J Roentgenol · June 2018
OBJECTIVE: The purpose of this study was to assess image noise, spatial resolution, lesion detectability, and the dose reduction potential of a proprietary third-generation adaptive statistical iterative reconstruction (ASIR-V) technique. MATERIALS AND MET ...
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Journal ArticleJ Am Coll Radiol · January 2017
PURPOSE: To determine the value of image-rich radiology reports (IRRR) by evaluating the interest and preferences of referring physicians, potential impact on clinical workflow, and the willingness of radiologists to create them. METHODS: Referring physici ...
Full textLink to itemCite
Journal ArticleAJR Am J Roentgenol · August 2016
OBJECTIVE: The purpose of this study was to prospectively investigate the clinical feasibility of adopting splenic enhancement for timing and triggering the acquisition of late hepatic arterial phase images during multiphasic liver MDCT for assessment of h ...
Full textLink to itemCite
Journal ArticleJ Magn Reson Imaging · June 2016
PURPOSE: To determine whether reader perception of a capsule affects reader interpretation of washout in hypervascular liver nodules at dynamic magnetic resonance imaging (MRI) in patients at risk for hepatocellular carcinoma (HCC). MATERIALS AND METHODS: ...
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Journal ArticleAJR Am J Roentgenol · June 2016
OBJECTIVE: The purpose of this study is to investigate whether the reduction in noise using a second-generation monoenergetic algorithm can improve the conspicuity of hypervascular liver tumors on dual-energy CT (DECT) images of the liver. MATERIALS AND ME ...
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Journal ArticleJ Magn Reson Imaging · May 2016
PURPOSE: To determine whether triple-arterial phase acquisition with fluoroscopic triggering can provide both well-timed early and late hepatic arterial phase (HAP) images more frequently than when using a fixed-time delay during gadoxetic acid-enhanced ma ...
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Journal ArticleRadiology · April 2016
PURPOSE: To determine the variance in virtual monochromatic computed tomography (CT) numbers from the same lesion, comparing the two clinically available dual-energy multidetector CT hardware implementations (single-source projection-based and dual-source ...
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Journal ArticleRadiology · April 2016
PURPOSE: To determine if radiation dose and reconstruction algorithm affect the computer-based extraction and analysis of quantitative imaging features in lung nodules, liver lesions, and renal stones at multi-detector row computed tomography (CT). MATERIA ...
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Journal ArticleAbdom Radiol (NY) · April 2016
Percutaneous abscess drainage (PAD) has been proven to be a safe, effective, and widely used technique for treatment of patients with intra-abdominal fluid collections. Indications for PAD are ever expanding, and most abscesses are amenable to PAD. PAD is ...
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Journal ArticleAbdom Imaging · October 2015
PURPOSE: To prospectively evaluate whether clinical experience with an adaptive statistical iterative reconstruction algorithm (ASiR) has an effect on radiologists' diagnostic performance and confidence for the diagnosis of hypervascular liver tumors, as w ...
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Journal ArticleAbdom Imaging · October 2015
PURPOSE: The purpose of the study was to document the clinical impact of CT in elderly patients presenting to the emergency department (ED) with abdominal pain. METHODS: This retrospective IRB-approved study from 2006 to 2013 evaluated 464 patients ≥80 yea ...
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Journal ArticleAbdom Imaging · October 2015
PURPOSE: Computed tomographic (CT) fluoroscopy-guided percutaneous cryoablation is an effective therapeutic method used to treat focal renal masses. The purpose of this study is to quantify the radiation dose to the patient and interventional radiologist d ...
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Journal ArticleAbdom Imaging · October 2015
OBJECTIVE: To determine the diagnostic performance of imaging criteria for distinguishing Ig-G4-associated autoimmune cholangiopathy (IAC) from primary sclerosing cholangitis (PSC) and bile duct malignancy. METHODS: A medical records search between January ...
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Journal ArticleAJR Am J Roentgenol · October 2015
OBJECTIVE: The purpose of this study was to investigate, both in a phantom experiment and a within-patient clinical study the relationships among radiation dose, image noise, pitch, and body size in MDCT angiography of the thoracoabdominal aorta, with the ...
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Journal ArticleAbdom Imaging · October 2015
Disease involving the pancreas can be a significant diagnostic challenge to the interpreting radiologist. Moreover, the majority of disease processes involving the pancreas carry high significant morbidity and mortality either due to their natural process ...
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Journal ArticleJ Magn Reson Imaging · August 2015
PURPOSE: To determine the rate of agreement between the Organ Procurement and Transplant Network (OPTN) and Liver Imaging Reporting and Data System (LI-RADS) classifications for hypervascular liver nodules at least 1 cm in diameter, and for patient eligibi ...
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Journal ArticleJ Vasc Interv Radiol · August 2015
PURPOSE: To compare the acute effects of radiofrequency (RF) ablation and cryoablation on the structural integrity of nontarget periarticular tissues that may be placed at risk during percutaneous bone ablation. MATERIALS AND METHODS: RF ablation and cryoa ...
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Journal ArticleAJR Am J Roentgenol · June 2015
OBJECTIVE: The purpose of this article is to provide the reader with a comprehensive overview of dual-energy MDCT applications for imaging renal masses. CONCLUSION: Dual-energy MDCT has the potential to substantially improve the ability of radiologists to ...
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Journal ArticleJ Magn Reson Imaging · April 2015
Ferumoxytol is an ultrasmall superparamagnetic iron oxide (USPIO) agent initially approved by the Food and Drug Administration (FDA) as an iron replacement therapy for patients with anemia due to chronic renal failure. Recently, ferumoxytol has been invest ...
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Journal ArticleEur Radiol · March 2015
PURPOSE: To assess the impact of patient habitus, acquisition parameters, detector efficiencies, and reconstruction techniques on the accuracy of iodine quantification using dual-source dual-energy CT (DECT). MATERIALS AND METHODS: Two phantoms simulating ...
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Journal ArticleRadiology · February 2015
PURPOSE: To determine whether contrast material-enhanced dual-energy multidetector computed tomography (CT) with material decomposition analysis allows differentiation of adrenal adenomas from nonadenomatous lesions and to compare findings with those of no ...
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Journal ArticleJ Comput Assist Tomogr · 2015
PURPOSE: The aim of the study was to assess the image quality of multi-detector-row computed tomography (CT) angiographic images of the thoracic aorta reconstructed with filtered back projection (FBP), adaptive statistical iterative reconstruction, and mod ...
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Journal ArticleJ Comput Assist Tomogr · 2015
PURPOSE: To investigate the optimal dual-energy reconstruction technique for the visualization of the hepatic arterial system during dual-energy multidetector computed tomographic (MDCT) angiography of the liver. MATERIALS AND METHODS: Twenty-nine nonconse ...
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ConferenceProgress in Biomedical Optics and Imaging - Proceedings of SPIE · January 1, 2015
Contrast enhancement is a key component of CT imaging and offer opportunities for optimization. The design and optimization of new techniques however requires orchestration with the scan parameters and further a methodology to relate contrast enhancement a ...
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Journal ArticleThyroid · December 2014
BACKGROUND: A 3-tiered system has been proposed by radiologists for the reporting and workup of incidental thyroid nodules (ITN) detected on computed tomography (CT), magnetic resonance imaging (MRI), or positron emission tomography/computed tomography (PE ...
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Journal ArticleUltrasound Q · December 2014
The American College of Radiology Appropriateness Criteria are evidence-based guidelines for specific clinical conditions that are reviewed every two years by a multidisciplinary expert panel. The guideline development and review include an extensive analy ...
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Journal ArticleAJR Am J Roentgenol · December 2014
OBJECTIVE: The purpose of this article is to investigate the effect of body size on the selection of optimal monochromatic energy level for maximizing the conspicuity of hypervascular liver tumors during late hepatic arterial phase using dual-energy MDCT. ...
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Journal ArticleRadiology · September 2014
PURPOSE: To determine whether virtual monochromatic imaging from a dual-energy acquisition can improve patient-to-patient uniformity of aortic enhancement during multi-detector row computed tomographic (CT) angiography. MATERIALS AND METHODS: This retrospe ...
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Journal ArticleRadiology · September 2014
PURPOSE: To investigate whether dual-energy multi-detector row computed tomography (CT) with virtual monochromatic imaging can overcome renal cyst pseudoenhancement in a phantom experiment and a clinical study. MATERIALS AND METHODS: This retrospective sin ...
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Journal ArticleAJR Am J Roentgenol · August 2014
OBJECTIVE: The purpose of this study was to determine MDCT dose variability due to technologist variability in performing CT studies. MATERIALS AND METHODS: Fifty consecutive adult patients who underwent two portal venous phase CT examinations of the abdom ...
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Journal ArticleWorld J Surg · June 2014
BACKGROUND: The aim of this study was to describe trends in the incidence of incidental thyroid cancers and compare their characteristics with clinically presenting cancers. METHODS: We performed a retrospective review of patients with thyroid cancer who u ...
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Journal ArticleAbdom Imaging · June 2014
PURPOSE: To determine the prevalence, resulting clinical decisions, and the positive predictive value (PPV) of venous filling defects detected on portal venous phase (PVP) CT. METHODS: Over a 3-year period, 42412 consecutive patients underwent a PVP abdomi ...
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Journal ArticleRadiology · June 2014
PURPOSE: To estimate the prevalence of incidental thyroid cancer (ITC) among patients undergoing thyroid surgery and to apply the Society of Radiologists in Ultrasound (SRU) guidelines to ITC. MATERIALS AND METHODS: This HIPAA-compliant study was approved ...
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Journal ArticleAcad Radiol · June 2014
RATIONALE AND OBJECTIVES: To evaluate clinical and imaging features associated with adequacy of the hepatocyte phase (HP) in gadoxetate disodium-enhanced liver magnetic resonance imaging (MRI) in patients without chronic liver disease (CLD). MATERIALS AND ...
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Journal ArticleAJR Am J Roentgenol · June 2014
OBJECTIVE: The objective of our study was to test the hypothesis that an intercostal approach to imaging-guided percutaneous subdiaphragmatic abscess drainage is as safe as a subcostal approach. MATERIALS AND METHODS: A cohort of 258 consecutive patients w ...
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Journal ArticleJ Am Coll Radiol · May 2014
PURPOSE: The aim of this study was to evaluate oncologists' opinions about the use of ionizing radiation in medical imaging of oncology patients. METHODS: An electronic survey was e-mailed to 2,725 oncologists at the top 50 National Cancer Institute-funded ...
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Journal ArticleRadiology · May 2014
Recent technologic advances in computed tomography (CT)--enabling the nearly simultaneous acquisition of clinical images using two different x-ray energy spectra--have sparked renewed interest in dual-energy CT. By interrogating the unique characteristics ...
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Book · May 1, 2014
This book provides a comprehensive and up-to-date overview of the continuously evolving field of dual-energy CT (DECT). An introductory section presents information on the physical and technical background of DECT and considers nonspecific and specific sof ...
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Chapter · May 1, 2014
The adrenal glands can develop a myriad of abnormalities, which can be fundamentally differentiated into benign or malignant lesions having either hyperfunction or non-hyperfunction (i.e., non-function) [1, 2]. Functioning lesions typically secrete hormona ...
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Journal ArticleJ Am Coll Radiol · March 2014
Acute right upper quadrant pain is a common presenting symptom in patients with acute cholecystitis. When acute cholecystitis is suspected in patients with right upper quadrant pain, in most clinical scenarios, the initial imaging modality of choice is ult ...
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Journal ArticleAJR Am J Roentgenol · March 2014
OBJECTIVE: The Society of Radiologists in Ultrasound (SRU) recommendations on thyroid nodules are intended to "diagnose thyroid cancers that have reached clinical significance, while avoiding unnecessary tests and surgery in patients with benign nodules." ...
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Journal ArticleEur Radiol · February 2014
With the expansion of cross-sectional imaging, the number of renal lesions that are incidentally discovered has increased. Multidetector CT (MDCT) is the investigation of choice for characterising and staging renal lesions. Although a definitive diagnosis ...
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Journal ArticleAJR Am J Roentgenol · January 2014
OBJECTIVE: The purpose of this study was to determine the number of thyroid nodule workups that could be eliminated and the number of malignant tumors that would be missed if the Society of Radiologists in Ultrasound (SRU) recommendations and the three-tie ...
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Journal ArticleAJNR Am J Neuroradiol · 2014
BACKGROUND AND PURPOSE: Incidental thyroid nodules are commonly seen on imaging, and their work-up can ultimately lead to surgery. We describe characteristics and pathology results of imaging-detected incidental thyroid nodules that underwent surgery. MATE ...
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Journal ArticleEur Radiol · December 2013
OBJECTIVES: To investigate the impact of an adaptive statistical iterative reconstruction (ASiR) algorithm on diagnostic accuracy and confidence for the diagnosis of hypervascular liver tumours, as well as the reader's perception of image quality, using a ...
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Chapter · November 1, 2013
Cirrhosis is a pathologic and clinical entity that occurs following repeated hepatocyte damage and is characterized by extensive fibrosis and innumerable regenerative nodules replacing the normal liver parenchyma. Ultimately, the process can lead to liver ...
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Chapter · May 1, 2013
Imaging of the pancreas is challenging because of its anatomic location in the retroperitoneum and its intricate relationship with major blood vessels and bowel [1]. In the United States, acute pancreatitis, chronic pancreatitis, and pancreatic cancer are ...
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Journal ArticleAJR Am J Roentgenol · May 2013
OBJECTIVE: The objective of this study was to evaluate the feasibility of using iterative reconstructions in hepatic CT to improve the precision of Hounsfield unit quantification, which is the degree to which repeated measurements under unchanged condition ...
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Journal ArticleAcad Radiol · April 2013
RATIONALE AND OBJECTIVES: Liver is a common site for distal metastases in colon and rectal cancer. Numerous clinical studies have analyzed the relative merits of different imaging modalities for detection of liver metastases. Several exciting new therapies ...
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Journal ArticleUltrasound Med Biol · March 2013
We present the results of a patient study conducted to assess the performance of two novel imaging methods, namely short-lag spatial coherence (SLSC) and harmonic spatial coherence imaging (HSCI), in an in vivo liver environment. Similar in appearance to t ...
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ConferenceMedical Physics · January 1, 2013
Purpose: Realistic three‐dimensional mathematical models of subtle lesions are essential for many CT studies focused on performance evaluation and optimization. The purpose of this work was to develop and apply a generic framework for creating such models ...
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Journal ArticleJ Comput Assist Tomogr · 2013
OBJECTIVES: The aim of this study was to determine the impact of catheter dwell time and gauge, catheter location, rate of contrast material administration, and patient age and sex on volume of extravasate at intravenous contrast-enhanced multidetector com ...
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Journal ArticleJ Comput Assist Tomogr · 2013
OBJECTIVE: To determine the prevalence of nutcracker phenomenon (left renal vein compression by the superior mesenteric artery) and secondary anatomic findings using multidetector computed tomographic (CT) angiography in an asymptomatic population. METHODS ...
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Journal ArticleJ Vasc Interv Radiol · November 2012
PURPOSE: To report short-term results of empiric transcatheter embolization for patients with advanced malignancy and gastrointestinal (GI) hemorrhage directly from a tumor invading the GI tract wall. MATERIALS AND METHODS: Between 2005 and 2011, 37 mesent ...
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Journal ArticleAJR Am J Roentgenol · November 2012
OBJECTIVE: The purpose of this article is to give a brief overview of the technical background of dual-energy CT (DECT) imaging and to review various DECT applications in the abdomen that are currently available for clinical practice. In a review of the re ...
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Journal ArticleAcad Radiol · September 2012
RATIONALE AND OBJECTIVES: To assess whether dual-energy computed tomography (DECT) multidetector computed tomography (MDCT) angiography improves vascular contrast beyond MDCT angiography and digital subtraction angiography (DSA) while preserving the abilit ...
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Journal ArticleInt J Cardiovasc Imaging · August 2012
To assess whether a scan triggering technique based on the slope of the time-attenuation curve combined with table speed optimization may improve arterial enhancement in aortic CT angiography compared to conventional threshold-based triggering techniques. ...
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Journal ArticleInvest Radiol · August 2012
OBJECTIVE: The aim of this study was to compare the image quality of abdominal computed tomography scans in an anthropomorphic phantom acquired at different radiation dose levels where each raw data set is reconstructed with both a standard convolution fil ...
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Journal ArticleJ Endourol · April 2012
BACKGROUND AND PURPOSE: Renal cryoablation has gained popularity as a treatment option for localized renal masses. Treatment success is typically defined by the absence of contrast enhancement on follow-up imaging. We investigate the evolution of lesions t ...
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Journal ArticleInvest Radiol · February 2012
OBJECTIVE: To evaluate the effect of the contrast medium (CM) concentration and the saline chaser volume and injection rate on first-pass aortic enhancement characteristics in contrast-enhanced magnetic resonance angiography using a physiologic flow phanto ...
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Book · January 19, 2012
Residents, fellows and practicing radiologists who are preparing for certification exams (the current ABR Part II oral, the future ABR Core and Certifying, CAQ and MOC) will find the new edition of this case-based review book an indispensable tool for succ ...
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Journal ArticleClin Imaging · 2012
This study tests whether the utilization of an electronic breath-hold monitoring device improves breath-hold reproducibility during computed tomographic (CT) scanning. Two cohorts of 40 patients underwent dual-phase abdominal CT scans, either with a breath ...
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Journal ArticleAm J Physiol Endocrinol Metab · November 2011
While the benefits of exercise are clear, many unresolved issues surround the optimal exercise prescription. Many organizations recommend aerobic training (AT) and resistance training (RT), yet few studies have compared their effects alone or in combinatio ...
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Journal ArticleEur Radiol · September 2011
OBJECTIVES: To prospectively investigate the effect of varying the injection flow rates of a saline chaser on vascular and parenchymal contrast enhancement during abdominal MDCT. METHODS: 100 consecutive patients were randomly assigned to four injection pr ...
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Journal ArticleBr J Radiol · August 2011
OBJECTIVES: The aim of this study was to compare the intraindividual effects of contrast material with two different iodine concentrations on the conspicuity of hepatocellular carcinoma (HCC) and vascular and hepatic contrast enhancement during multiphasic ...
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Journal ArticleAcad Radiol · July 2011
RATIONALE AND OBJECTIVES: To determine whether an unenhanced low-dose image acquired during automated contrast bolus timing can be used to assess hepatic steatosis. MATERIALS AND METHODS: Fifty subjects (29 male, 21 female; 26-92 years; mean body mass inde ...
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Journal ArticleAJR Am J Roentgenol · July 2011
OBJECTIVE: In this review, we attempt to address many of the issues that are related to ensuring patient benefit in body CT, balancing the use of ionizing radiation and iodinated contrast media. We attempt to not only summarize the literature but also make ...
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Journal ArticleAJR Am J Roentgenol · June 2011
OBJECTIVE: The purpose of this article is to assess the impact of large patient size on the detection of hypovascular liver tumors with MDCT and the effect of a noise filter on image quality and lesion detection in obese patients. MATERIALS AND METHODS: A ...
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Journal ArticleAJR Am J Roentgenol · April 2011
OBJECTIVE: The purpose of this study was to determine the incidence of collecting system and hemorrhagic complications resulting from CT-guided percutaneous cryoablation of renal tumors in which the radiographic ice ball abuts or involves the renal sinus. ...
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Journal ArticleAm Surg · April 2011
The purpose of our study is to determine whether body mass index (BMI = weight in kg/height in meters(2)) was related to the rate of negative appendectomy in patients who underwent preoperative CT. A surgical database search performed using the procedure c ...
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Journal ArticleJ Cardiovasc Comput Tomogr · 2011
The radiation doses associated with diagnostic CT scans has recently come under scrutiny. In the process of developing protocols with lower doses, it has become apparent that images reconstructed with a filtered back projection (FBP) technique are often in ...
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Journal ArticleRadiology · August 2010
PURPOSE: To intraindividually compare a low-tube-voltage (80 kVp), high-tube-current (675 mA) computed tomographic (CT) technique with a high-tube-voltage (140 kVp) CT protocol for the detection of pancreatic tumors, image quality, and radiation dose durin ...
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Journal ArticleRadiology · August 2010
PURPOSE: To assess the effect of beam hardening on arterial enhancement in thoracoabdominal computed tomographic (CT) angiography in various body sizes in a phantom and in a clinical study. MATERIALS AND METHODS: An abdominal aortic phantom was placed in t ...
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Journal ArticleEur Urol · July 2010
BACKGROUND: Laparoscopic cryoablation (LCA) and percutaneous cryoablation (PCA) of small renal masses have gained popularity, but only limited data exist on the complication rates. OBJECTIVES: In this study, we report on postoperative complications associa ...
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Journal ArticleAJR Am J Roentgenol · June 2010
OBJECTIVE: The purpose of this study was to determine whether use of dual-energy technique can improve the diagnostic performance of CT in the differential diagnosis of adrenal adenomas and metastatic lesions. SUBJECTS AND METHODS: Thirty-one adrenal nodul ...
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Journal ArticleAm Surg · March 2010
The purpose of this study was to determine if carcinoid tumors of the appendix were identified prospectively on preoperative CT at our institution during the last decade. A surgical database search performed using the Current Procedural Terminology codes f ...
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Journal ArticleRadiology · February 2010
PURPOSE: To determine the frequency of preoperative computed tomography (CT) in the evaluation of patients suspected of having appendicitis at one institution during the past 10 years and to determine whether changes in CT utilization were associated with ...
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Journal ArticleRadiology · January 2010
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PURPOSE: To evaluate the capability of spectral computed tomography (CT) to improve the characterization of cystic high-attenuation lesions in a renal phantom and to test the hypothesis that spectral CT will improve the differentiation of cystic renal lesi ...
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Journal ArticleRadiographics · 2010
Dual-energy CT provides information about how substances behave at different energies, the ability to generate virtual unenhanced datasets, and improved detection of iodine-containing substances on low-energy images. Knowing how a substance behaves at two ...
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Journal ArticleRadiology · January 2010
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PURPOSE: To investigate whether an adaptive statistical iterative reconstruction (ASIR) algorithm improves the image quality at low-tube-voltage (80-kVp), high-tube-current (675-mA) multidetector abdominal computed tomography (CT) during the late hepatic a ...
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Journal ArticleRadiology · December 2009
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PURPOSE: To evaluate a widely used nontunneled triple-lumen central venous catheter in order to determine whether the largest of the three lumina (16 gauge) can tolerate high flow rates, such as those required for computed tomographic angiography. MATERIAL ...
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Journal ArticleAJR Am J Roentgenol · December 2009
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OBJECTIVE: The purpose of our study was to evaluate the effect of varying volumes and rates of contrast material, use of a saline chaser, and cardiac output on aortic enhancement characteristics in MDCT angiography (MDCTA) using a physiologic phantom. MATE ...
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Journal ArticleAcad Radiol · November 2009
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RATIONALE AND OBJECTIVES: The aim of this study was to measure the radiation dose of dual-energy and single-energy multidetector computed tomographic (CT) imaging using adult liver, renal, and aortic imaging protocols. MATERIALS AND METHODS: Dual-energy CT ...
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Journal ArticleAJR Am J Roentgenol · October 2009
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OBJECTIVE: The objective of our study was to determine, using an anthropomorphic phantom, whether patients are subject to variable radiation doses based on scanner assignment for common body CT studies. MATERIALS AND METHODS: Twenty metal oxide semiconduct ...
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Journal ArticleAJR Am J Roentgenol · October 2009
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OBJECTIVE: The purpose of this study was to compare a standard peripheral end-hole angiocatheter with those modified with side holes or side slits using experimental optical techniques to qualitatively compare the contrast material exit jets and using nume ...
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Journal ArticleAcad Radiol · August 2009
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RATIONALE AND OBJECTIVES: To evaluate the effect of automatic tube current modulation on radiation dose and image quality for low tube voltage computed tomography (CT) angiography. MATERIALS AND METHODS: An anthropomorphic phantom was scanned with a 64-sec ...
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Journal ArticleRadiology · June 2009
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PURPOSE: To intraindividually compare a low tube voltage (80 kVp), high tube current computed tomographic (CT) technique with a standard CT protocol (140 kVp) in terms of image quality, radiation dose, and detection of malignant hypervascular liver tumors ...
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Journal ArticleAJR Am J Roentgenol · January 2009
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OBJECTIVE: The purpose of this study was to assess whether radiation dose savings using a lower peak kilovoltage (kVp) setting, bismuth breast shields, and automatic tube current modulation could be achieved while preserving the image quality of MDCT scans ...
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Journal Article · December 1, 2008
Hepatobiliary imaging by computed tomography (CT) has advanced impressively since the introduction of multidetector CT (MDCT) scanners in the late 1990s. Over the last few years, the number of detector rows has increased progressively from four, to eight, ...
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Journal ArticleJ Endourol · November 2008
PURPOSE: We evaluated the clinical implication of persistent contrast enhancement demonstrated several months after laparoscopic renal cryoablation of a small renal mass. PATIENTS AND METHODS: Between September 2000 and May 2007, 30 patients underwent lapa ...
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Journal ArticleUltrasound Med Biol · October 2008
The initial results from clinical trials investigating the utility of acoustic radiation force impulse (ARFI) imaging for use with radio-frequency ablation (RFA) procedures in the liver are presented. To date, data have been collected from 6 RFA procedures ...
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Journal ArticleEur Radiol · August 2008
The effect of varying injection rates of a saline chaser on aortic enhancement in computed tomography (CT) angiography was determined. Single-level, dynamic CT images of a physiological flow phantom were acquired between 0 and 50 s after initiation of cont ...
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Journal ArticleAJR Am J Roentgenol · April 2008
OBJECTIVE: The objective of our study was to correlate the estimated fetal absorbed radiation dose derived by directly measured uterine doses in the early first trimester and the volume CT dose index (CTDI(vol)) for 16-MDCT of the maternal chest, abdomen, ...
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Journal ArticleAJR Am J Roentgenol · February 2008
OBJECTIVE: The purpose of this study was to evaluate in a phantom study the effect of patient size on radiation dose for abdominal MDCT with automatic tube current modulation. MATERIALS AND METHODS: One or two 4-cm-thick circumferential layers of fat-equiv ...
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Journal ArticlePhys Med Biol · January 7, 2008
The utility of acoustic radiation force impulse (ARFI) imaging for real-time visualization of abdominal malignancies was investigated. Nine patients presenting with suspicious masses in the liver (n = 7) or kidney (n = 2) underwent combined sonography/ARFI ...
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Journal ArticleRadiology · January 2008
PURPOSE: To prospectively evaluate, for the depiction of simulated hypervascular liver lesions in a phantom, the effect of a low tube voltage, high tube current computed tomographic (CT) technique on image noise, contrast-to-noise ratio (CNR), lesion consp ...
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Journal ArticleInvest Radiol · December 2007
OBJECTIVES: To prospectively compare the effects on heart rate (HR) and contrast enhancement efficacy of iopamidol-370 and iodixanol-320 in contrast-enhanced, multidetector-row computed tomography (CE-MDCT). METHODS: IMPACT is a multicenter, double-blind s ...
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ConferenceProceedings - IEEE Ultrasonics Symposium · December 1, 2007
The initial results from an ongoing clinical study investigating the utility of Acoustic Radiation Force Impulse (ARFI) imaging for in vivo visualization of abdominal lesions are presented. To date, 13 patients with lesions located in the liver (n = 11) or ...
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Journal ArticleEur Radiol · October 2007
The optimal temporal window of intravenous (IV) computed tomography (CT) cholangiography was prospectively determined. Fifteen volunteers (eight women, seven men; mean age, 38 years) underwent dynamic CT cholangiography. Two unenhanced images were acquired ...
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Journal ArticleRadiology · May 2007
PURPOSE: To prospectively evaluate the use of lean body weight (LBW) as the main determinant of the volume and rate of contrast material administration during multi-detector row computed tomography of the liver. MATERIALS AND METHODS: This HIPAA-compliant ...
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Journal ArticleRadiology · May 2007
PURPOSE: To prospectively determine quantitatively and qualitatively the timing of maximal enhancement of the normal small-bowel wall by using contrast material-enhanced multi-detector row computed tomography (CT). MATERIALS AND METHODS: This HIPAA-complia ...
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Journal ArticleAcad Radiol · April 2007
RATIONALE AND OBJECTIVES: To evaluate the effect of a modified abdominal multislice computed tomography (CT) protocol for obese patients on image quality and radiation dose. MATERIALS AND METHODS: An adult female anthropomorphic phantom was used to simulat ...
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Journal ArticleAJR Am J Roentgenol · March 2007
OBJECTIVE: Protocols for PET/CT are not yet standardized. In particular, image quality, utilization, and reporting of the findings of the CT component of PET/CT can vary widely, making it complicated for physicians to request the appropriate information. I ...
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Journal ArticleRadiology · January 2007
PURPOSE: To retrospectively assess if reader detection of intraabdominal pathologic findings on coronal reformations from isotropic voxels at 16-section computed tomography (CT) was similar to reader detection on transverse scans. MATERIALS AND METHODS: Th ...
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Journal ArticleUrology · December 2006
Patients with metachronous bilateral renal cell carcinoma pose a significant challenge given the high mortality of renal cell carcinoma and the poor quality of life should dialysis become necessary. In addition, patients may be subject to morbidity due to ...
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Journal ArticleInvest Radiol · November 2006
BACKGROUND: Based on a single clinical trial, it has been suggested that the contrast agent iodixanol, which is isotonic to human plasma, may be less nephrotoxic than other nonionic contrast agents in renally impaired patients after intra-arterial injectio ...
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Journal ArticleJ Vasc Interv Radiol · October 2006
PURPOSE: To determine the risks and benefits of percutaneous radiofrequency (RF) ablation of recurrent hepatic tumors in patients who have undergone hepatic resection. MATERIALS AND METHODS: Retrospective review of the institutional RF ablation database yi ...
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Journal ArticleAcad Radiol · October 2006
RATIONALE AND OBJECTIVES: The purpose of this study was to calculate the gain in signal-to-noise ratio (SNR) of four human abdominal tissues at 3.0 Tesla (T) compared with standard 1.5 T and to validate this calculation in vivo. MATERIALS AND METHODS: The ...
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Journal ArticlePhys Med Biol · August 7, 2006
Previous studies have established the feasibility of monitoring radiofrequency (RF) ablation procedures with acoustic radiation force impulse (ARFI) imaging. However, questions remained regarding the utility of the technique in clinically realistic scenari ...
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Journal ArticleAJR Am J Roentgenol · May 2006
OBJECTIVE: This retrospective study was conducted to determine the incidence of sepsis at our institution after percutaneous drainage of a hepatic abscess. MATERIALS AND METHODS: Thirty-three patients with a hepatic abscess treated using percutaneous aspir ...
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Journal ArticleRadiology · March 2006
PURPOSE: To compare the performance characteristics of various single-lumen all-purpose pigtail drainage catheters. MATERIALS AND METHODS: The following parameters were compared: flow rates between catheters of the same size, whether changing the fluid vis ...
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Journal Article · January 1, 2006
Hepatobiliary imaging by computed tomography (CT) has advanced impressively since the introduction of multidetector CT (MDCT) scanners in the late 1990s. Over the last few years, the number of detector rows has increased progressively from four, to eight, ...
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Journal ArticleRadiographics · 2006
A T1-weighted gradient-echo in-phase and opposed-phase sequence has become a routine part of every hepatic magnetic resonance (MR) imaging protocol. Although this sequence is primarily used to identify common pathologic conditions, such as diffuse or focal ...
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Journal ArticleRadiology · January 2006
Institutional review board approval and waiver of consent were obtained for the patient component of this retrospective HIPAA-compliant study. By using an anthropomorphic phantom and metal oxide semiconductor field effect transistor detectors, radiation do ...
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Journal ArticleUrology · December 2005
OBJECTIVES: To evaluate our experience with percutaneous radiofrequency ablation (pRFA) to determine common characteristics of patients with complications, to elucidate possible relative contraindications to therapy. METHODS: Medical records of all patient ...
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Journal ArticleUltrasound Med Biol · September 2005
The feasibility of utilizing acoustic radiation force impulse (ARFI) imaging to assess the mechanical properties of abdominal tissues was investigated. The thermal safety of the technique was also evaluated through the use of finite element method models. ...
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Journal ArticleJ Urol · June 2005
PURPOSE: Although ablative technologies, including radio frequency (RF) ablation (RFA) and cryoablation (CA), are being used to treat renal masses, complications associated with injury to vital renal structures are not well understood. We investigated thes ...
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Journal ArticleGastrointest Endosc · June 2005
BACKGROUND: Image-guided FNA is a popular method for evaluating pancreatic lesions, but few large studies on pancreatic FNA exist. METHODS: Cytologic material, imaging reports, and clinical follow-up information were reviewed from pancreatic FNA cases perf ...
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Journal ArticleRadiology · June 2005
PURPOSE: To assess retrospectively the added value of coronal reformations from isotropic voxels obtained with 16-section multi-detector row computed tomography (CT) of the abdomen and pelvis in patients with suspected acute appendicitis. MATERIALS AND MET ...
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Chapter · January 1, 2005
When discussing computed tomography (CT), it is interesting and useful to review the evolution of this technology since its inception. In the early 1970s, axial scanners were ?rst introduced. These scanners had large cables attaching the X-ray tube to the ...
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Journal ArticleRadiology · December 2004
PURPOSE: To evaluate current practice patterns of percutaneous image-guided abdominal and pelvic abscess drainage in academic and private practice centers. MATERIALS AND METHODS: The institutional review board did not require approval for this study. In a ...
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Journal ArticleAJR Am J Roentgenol · December 2004
OBJECTIVE: We sought to evaluate the accuracy of dual-phase MDCT angiography for assessing the liver before hepatic resection and to compare 2D and 3D images for quality and arterial branch visualization. MATERIALS AND METHODS: Sixty-three patients with co ...
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Journal ArticleProceedings - IEEE Ultrasonics Symposium · December 1, 2004
The goal of this investigation is to examine the feasibility of guiding interventional devices using piezoelectric buzzers to create a velocity source, which is imaged and tracked with real time 3D (RT3D) ultrasound and Color Doppler. Interventional device ...
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Journal ArticleRadiology · September 2004
PURPOSE: To prospectively evaluate a technique for optimizing aortoiliac enhancement at multi-detector row helical computed tomography (CT) with both the scanning delay and contrast medium dose determined by using an interactive method. MATERIALS AND METHO ...
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Journal ArticleUltrason Imaging · July 2004
The goal of this investigation was to examine the feasibility of guiding interventional devices using piezoelectric buzzers to create velocity sources, which were imaged and tracked with real-time 3D color flow Doppler. The interventional devices examined ...
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Journal ArticleAcad Radiol · March 2004
RATIONALE AND OBJECTIVES: The purpose of this study was to compare hepatic enhancement characteristics using two different contrast media injection protocols with multidetector helical computed tomography. MATERIALS AND METHODS: Twenty-three patients with ...
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Journal ArticleJ Comput Assist Tomogr · 2004
This article is based on lectures which were given at the Multidetector Computed Tomography Conference in Washington, D.C. on September 13-14, 2003. Specifically, this article summarizes the Abdominal Imaging Section of this meeting. It is not an exhaustiv ...
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Journal ArticleGastrointest Endosc · November 2003
BACKGROUND: Studies have suggested an increased risk of peritoneal seeding in patients with pancreatic cancer diagnosed by percutaneous FNA. EUS-FNA is an alternate method of diagnosis. The aim of this study was to compare the frequency of peritoneal carci ...
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Journal ArticleRadiology · November 2003
PURPOSE: To determine the accuracy of unenhanced helical computed tomography (CT) performed at reduced milliampere-second, and therefore at a reduced patient radiation dose, by using conventional unenhanced helical CT as the standard. MATERIALS AND METHODS ...
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Journal ArticleRadiology · June 2003
PURPOSE: To evaluate protocols for abdominal imaging with an eight-element multi-detector row computed tomographic (CT) scanner. MATERIALS AND METHODS: An eight-element helical CT scanner was used to acquire data in two phantoms with four-element (pitch, 0 ...
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Journal ArticleAcad Radiol · April 2003
RATIONALE AND OBJECTIVES: The purpose of this study was twofold: (a) to compare the radiation dose profile between computed tomography (CT) with a single detector row (SD) and with a multi-detector row (MD) and (b) to compare specific organ doses between S ...
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Journal ArticleCirc Res · February 21, 2003
Endothelial cell proteinase activated receptors (PARs) belong to a family of heterotrimeric G protein-coupled receptors that are implicated in leukocyte accumulation and potentiation of reperfusion injury. We characterized the effect and the signal transdu ...
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Journal ArticleJ Comput Assist Tomogr · 2003
The speed and flexibility of multidetector computed tomography (MDCT) have led to improvements in liver imaging, particularly related to the detection and characterization of focal lesions. This report discusses the different phase of liver enhancement fol ...
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Journal ArticleClin Nucl Med · August 2002
PURPOSE: The authors' goal was to determine the sensitivity and specificity of F-18 fluorodeoxyglucose (FDG) positron emission tomography (PET) for identifying patients with hepatic metastases from colorectal cancer and the accuracy of PET for determining ...
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Journal ArticleAJR Am J Roentgenol · May 2002
OBJECTIVE: This study was undertaken as a pilot investigation to compare multidetector CT angiography with conventional catheter angiography for the visualization of the renal artery lumen after renal artery stent placement. SUBJECTS AND METHODS: CT angiog ...
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Journal ArticleAcad Radiol · April 2002
RATIONALE AND OBJECTIVES: The authors performed this study to evaluate the ability of an artificial neural network (ANN) that uses radiologic and laboratory data to predict the outcome in patients with acute pancreatitis. MATERIALS AND METHODS: An ANN was ...
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Journal ArticlePharmacoepidemiol Drug Saf · March 2002
Governments, manufacturers, and other entities are interested in adverse event surveillance of marketed medical products. FDA's Center for Drug Evaluation and Research redesigned the post-marketing adverse reaction surveillance process to use the advantage ...
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Journal ArticleAJR Am J Roentgenol · February 2002
OBJECTIVE: The purpose of our study was to compare MR cholangiopancreatography and contrast-enhanced cholangiography in patients with sclerosing cholangitis. MATERIALS AND METHODS: Twenty patients with sclerosing cholangitis were evaluated on MR cholangiop ...
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Journal ArticleJ Comput Assist Tomogr · 2002
PURPOSE: The purpose of this work was to compare the extent of pseudoenhancement (artifactual increase in measured attenuation of a simple cyst after contrast medium administration) in a phantom model on single detector and multidetector helical CT scanner ...
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Journal ArticleRadiology · January 2002
Fifty-two patients with known or suspected hypervascular malignancy were examined to determine the technical feasibility of performing single-breath-hold dynamic subtraction computed tomography (CT) of the liver with multi-detector row helical CT. The prec ...
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Journal ArticleAJR Am J Roentgenol · August 2001
OBJECTIVE: In September 1998, we began to treat iatrogenic femoral pseudoaneurysms with direct thrombin injection under sonographic guidance. Our purpose was to determine the success and complication rate of this technique. SUBJECTS AND METHODS: We treated ...
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Journal ArticleRadiology · July 2001
PURPOSE: To assess the effects of age and blood pressure at the time of scanning on internal carotid artery velocities and cross-sectional diameter at Doppler ultrasonography (US). MATERIALS AND METHODS: During 12 months, 1,020 consecutive patients underwe ...
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Journal ArticleAJR Am J Roentgenol · June 2001
OBJECTIVE: The purpose of this study was to compare two-dimensional curved multiplanar and three-dimensional reconstructions, routine axial presentations, and combined techniques in the assessment of vascular involvement by pancreatic malignancy. MATERIALS ...
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Journal ArticleRadiology · April 2001
PURPOSE: To compare image quality on transverse source images and coronal and sagittal reformations to determine the feasibility of using single-breath-hold three-dimensional liver computed tomography (CT) with multi-detector row helical CT in patients sus ...
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Journal ArticleRadiology · March 2001
An electronic device for guiding needle placement during sonographically directed percutaneous intervention was tested in a phantom and then in patients. In the phantom, targeting accuracy was similar for use of the needle guide alone, the needle guide wit ...
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Journal ArticleJ Endourol · February 2001
The applications of three-dimensional (3D) CT techniques encompass a spectrum from calculus disease to preoperative planning. With proper selection of display windows and levels, accurate measurement of stone size can be achieved, along with volumetric inf ...
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Journal ArticleJ Comput Assist Tomogr · 2001
OBJECTIVE: The purpose of this study was to evaluate opacification of the collecting system and ureters using compression computed tomography (CT) urography compared with conventional intravenous urography (IVU). MATERIALS AND METHODS: Fifty consecutive pa ...
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Journal ArticleRadiology · December 2000
PURPOSE: To compare nonenhanced helical computed tomography (CT) with ultrasonography (US) for the depiction of urolithiasis. MATERIALS AND METHODS: During 9 months, 45 patients (mean age, 44 years; mean weight, 92.5 kg) prospectively underwent both nonenh ...
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Journal ArticleJ Magn Reson Imaging · July 2000
The short-term safety of mangafodipir trisodium (MnDPDP) injection was studied in 546 adults with known or suspected focal liver lesions. An initial contrast-enhanced computed tomography examination was followed by unenhanced magnetic resonance imaging (MR ...
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Journal ArticleRadiology · May 2000
PURPOSE: To evaluate and compare the treatment of iatrogenic femoral arterial pseudoaneurysms by using ultrasonographically (US) guided direct thrombin injection with US-guided compression repair. MATERIALS AND METHODS: Twenty-six patients with iatrogenic ...
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Journal ArticleAJR Am J Roentgenol · May 2000
OBJECTIVE: Physician competence in the performance of sonographic studies was assessed after their involvement in predetermined increments of cases to determine whether the case volumes currently required by the American Institute of Ultrasound in Medicine ...
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Journal ArticleAJR Am J Roentgenol · April 2000
OBJECTIVE: Procedure times for percutaneous biopsies were compared for various guidance techniques including helical CT, CT fluoroscopy, sonography with an attached needle guide, and freehand sonography with computer guidance. MATERIALS AND METHODS: Three ...
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Journal ArticleRadiology · March 2000
PURPOSE: To evaluate the efficacy of hepatic enhancement characteristics for identification of patients with breast cancer who are at risk for future hepatic metastases. MATERIALS AND METHODS: Triple-phase helical computed tomography (CT) was performed in ...
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Journal ArticleAJR Am J Roentgenol · February 2000
OBJECTIVE: We evaluated the feasibility and image quality of a new noninvasive biliary imaging technique: helical CT cholangiography with three-dimensional volume rendering using an oral biliary contrast agent. SUBJECTS AND METHODS: Nineteen subjects inclu ...
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Journal ArticleAJR Am J Roentgenol · February 2000
OBJECTIVE: The purpose of our study was to evaluate renal cyst pseudoenhancement during helical CT in a phantom model and in patients. MATERIALS AND METHODS: Iodine baths containing water-filled spheres and cylinders were constructed to simulate cysts in e ...
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Journal ArticleRadiology · January 2000
PURPOSE: To characterize pelvic morphometric differences in patients with and those without Down syndrome by using computed tomography (CT) and to determine useful indexes for ultrasonographic (US) evaluation. MATERIALS AND METHODS: Pelvic CT scans in seve ...
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Journal ArticleRadiographics · 2000
Magnetic resonance cholangiopancreatography (MRCP) is used for noninvasive work-up of patients with pancreaticobiliary disease. MRCP is comparable with invasive endoscopic retrograde cholangiopancreatography (ERCP) for diagnosis of extrahepatic bile duct a ...
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Journal ArticleAbdom Imaging · 2000
BACKGROUND: Multisection helical computed tomography (CT) has the potential for providing data sets with better section profiles, more anatomic coverage, and shorter breath-holding periods. Our purpose was to quantitate these advantages in a clinical setti ...
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Journal ArticleRadiographics · 2000
Magnetic resonance cholangiopancreatography (MRCP) is a relatively new, noninvasive cholangiographic technique that is comparable with invasive endoscopic retrograde cholangiopancreatography (ERCP) in the detection and characterization of extrahepatic bile ...
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Journal ArticleAJR Am J Roentgenol · November 1999
OBJECTIVE: We compared the relative cost of a liver biopsy performed with sonographic guidance with that of one performed with CT guidance in a cost-benefit analysis model. MATERIALS AND METHODS: Variables were estimated from a search of the literature and ...
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Journal ArticleAJR Am J Roentgenol · November 1999
OBJECTIVE: The goal of this study was to determine the relative accuracy of interpretation of sonography when viewed on a monitor or on film. MATERIALS AND METHODS: Four radiologists twice interpreted a series of 440 sonograms using the following sequences ...
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Journal ArticleJ Immunol · October 15, 1999
In vivo, MHC class I-restricted injury of allogeneic tissue or cells infected by intracellular pathogens occurs in the absence of classical cytolytic effector mechanisms and Ab. Modulation of the target cell adhesion to matrix may be an additional mechanis ...
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Journal ArticleRadiology · September 1999
PURPOSE: To determine if patients with multiple fluid collections need every collection aspirated and if cross-contamination is a risk if separate sterile procedures are not followed for each aspiration. MATERIALS AND METHODS: Records from 1,076 imaging-gu ...
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Journal ArticleAJR Am J Roentgenol · August 1999
OBJECTIVE: Our purpose was to determine the outcome of patients in whom the results of imaging-guided biopsies were indeterminate and to examine factors that may affect outcome. MATERIALS AND METHODS: During a 25-month period, 619 consecutive imaging-guide ...
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Journal ArticleRadiology · August 1999
PURPOSE: To assess the ability of an extravasation detection accessory (EDA) to detect clinically important (> or = 10 mL) extravascular injection of iodinated contrast material delivered with an automated power injector. MATERIALS AND METHODS: Five hundre ...
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Journal ArticleDiagn Cytopathol · August 1999
Cytomorphology in conjunction with immunophenotypic characterization is becoming increasingly used for the primary diagnosis of non-Hodgkin's lymphomas (NHL). This combination is especially advantageous for the diagnosis of intra-abdominal and intrathoraci ...
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Journal ArticleEmergency Radiology · July 6, 1999
Massive enlargement of the ovary secondary to theca lutein cysts can result in ovarian torsion, cyst rupture, or severe abdominal pain. We report a case of ultrasound-guided aspiration of theca lutein cysts resulting in symptomatic relief. ...
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Journal ArticleAJR Am J Roentgenol · April 1999
OBJECTIVE: The purpose of this study is to determine the safety and effectiveness of percutaneous imaging-guided biopsy in the diagnosis of focal splenic lesions. MATERIALS AND METHODS: From May 1995 to November 1997, 20 imaging-guided biopsies of focal sp ...
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Journal ArticleAJR Am J Roentgenol · April 1999
OBJECTIVE: The purpose of this study was to evaluate triple-phase helical CT for detection of hepatic metastases from breast carcinoma. SUBJECTS AND METHODS: Breast cancer patients were studied prospectively with triple-phase helical CT in 300 consecutive ...
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Journal ArticleJ Magn Reson Imaging · February 1999
The purpose of this study was to evaluate the safety and efficacy of OptiMARK (gadoversetamide injection) compared with Magnevist (gadopentetate dimeglumine) in hepatic MRI of patients with suspected liver pathology. A Phase III, multicenter, randomized, d ...
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Journal ArticleJ Comput Assist Tomogr · 1999
PURPOSE: To review the normal radiologic appearance of pancreatic transplants that use portal venous and enteric drainage, and to review the appearance of a variety of postoperative complications. METHOD: We retrospectively reviewed the computed tomographi ...
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Journal ArticleAbdom Imaging · 1999
BACKGROUND: To evaluate the diagnostic value of oblique views of the pharynx in patients with dysphagia. METHODS: One hundred thirty-three patients with symptoms referable to the cervical region underwent pharyngoesophography that included views of the pha ...
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Journal ArticleRadiology · December 1998
PURPOSE: To determine how often a prescribed threshold of hepatic contrast material enhancement is not reached at helical computed tomography (CT) of the liver in patients in a tertiary teaching hospital-based practice and which variables are predictive of ...
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Journal ArticleRadiology · December 1998
To detect extravasation of contrast media during mechanical power injection at dynamic computed tomography, a 5 x 8-cm pliable adhesive patch was applied to the skin over the intravenous cannula and connected to the power injector with a cable to monitor e ...
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Journal ArticleGastrointestinal Endoscopy · December 1, 1998
There is considerable debate regarding the optimal management of pancreatic necrosis (PN). The timing and utility of endoscopic retrograde cholangiopancreatograms (ERCP) in the subset of acute pancreatitis who have PN is unclear. Objectives: It To determin ...
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Journal ArticleGastrointestinal Endoscopy · December 1, 1998
Background: Endoscopic ultrasound (EUS) and endoscopic retrograde cholangiopancreatography (ERCP) are useful techniques in the evaluation of patients (pts) with biliary and pancreatic diseases. Pts undergoing EUS are commonly undergoing ERCP as well. The u ...
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Journal ArticleAcad Radiol · July 1998
RATIONALE AND OBJECTIVES: The authors investigated the use of an artificial neural network (ANN) to aid in the diagnosis of intraabdominal abscess. MATERIALS AND METHODS: An ANN was constructed based on data from 140 patients who underwent abdominal and pe ...
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Journal ArticleRadiology · June 1998
PURPOSE: To compare ultrasound (US) with computed tomography (CT) as a guidance modality for percutaneous interventional procedures. MATERIALS AND METHODS: A database of abdominal interventional procedures was reviewed for the 6 months preceding and 6 mont ...
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Journal ArticleRadiology · June 1998
PURPOSE: To determine if the prandial effect outweighs variability in the measurement of portal venous blood flow and hepatic arterial resistive index. MATERIALS AND METHODS: Fourteen healthy adult volunteers fasted overnight. For eight of the subjects, tw ...
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Journal ArticleAm J Clin Pathol · April 1998
Gastrointestinal stromal tumors are a group of neoplasms encompassing leiomyoma, leiomyosarcoma, and an epithelioid variant of leiomyosarcoma, as well as lesions expressing neural differentiation. These neoplasms are rare and account for 1% of all gastroin ...
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Journal ArticleRadiology · February 1998
PURPOSE: To investigate effects of a liquid meal on contrast material enhancement at dynamic helical computed tomography (CT). MATERIALS AND METHODS: Twenty healthy, fasting subjects underwent intravenous injection of nonionic contrast material at 4 mL/sec ...
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Journal ArticleRadiology · February 1998
PURPOSE: To evaluate the efficacy of SH U 555 A in three doses for magnetic resonance (MR) imaging in the liver and to establish the best postinjection time point for liver MR imaging. MATERIALS AND METHODS: Pre- and postcontrast image sets obtained in 169 ...
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Journal ArticleEur J Radiol · February 1998
We report the MR imaging findings in a patient with primary antiphospholipid syndrome, adrenal infarction and widespread thrombosis involving abdominal, pelvic, and pulmonary vessels. This syndrome should be suspected in patients with thromboses and organ ...
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Journal ArticleRadiology · January 1998
PURPOSE: To evaluate triple-phase helical computed tomography (CT) of carcinoid liver metastases. MATERIALS AND METHODS: Triple-phase helical CT was performed in 31 patients with proved carcinoid liver metastases. Hepatic arterial-dominant phase (HAP) and ...
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Journal ArticleJ Comput Assist Tomogr · 1998
PURPOSE: The purpose of this study was to analyze interobserver agreement in the interpretation of unenhanced helical CT (UHCT) for the evaluation of ureteral stone disease and obstruction. METHOD: One hundred three UHCT examinations were independently and ...
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Journal ArticleJournal of Urology · January 1, 1998
Purpose: We determined the value of unenhanced helical computerized tomography (CT) in the diagnosis of acute flank pain in 105 patients evaluated for suspected stone disease. Materials and Methods: Noncontrasted spiral CT was done in 105 consecutive patie ...
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Journal ArticleAcad Radiol · December 1997
RATIONALE AND OBJECTIVES: The interpretation of an abdominal computed tomographic (CT) scan is occasionally inconclusive. In many of these cases, the radiologist suggests an additional imaging test for further confirmation or clarification. The purpose of ...
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Journal ArticleAJR Am J Roentgenol · December 1997
OBJECTIVE: The purpose of this study was to determine the optimal time for obtaining delayed images with contrast-enhanced CT in patients who have intrahepatic or hilar cholangiocarcinoma. SUBJECTS AND METHODS: CT studies were performed in 25 consecutive p ...
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Journal ArticleRadiology · November 1997
PURPOSE: To determine the relative value of hepatic arterial and portal venous phase helical computed tomographic (CT) scans for tumor detection and vascular opacification in patients with pancreatic malignancy. MATERIALS AND METHODS: Ninety-five patients ...
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Journal ArticleRadiology · October 1997
PURPOSE: To evaluate the usefulness of sonographically guided percutaneous biopsy of small lymph nodes in the abdomen, retroperitoneum, and pelvis. MATERIALS AND METHODS: From May 1995 through January 1997, 35 sonographically guided lymph node biopsies wer ...
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Journal ArticleRadiology · April 1997
PURPOSE: To investigate the effect of arterial injection site and splenic volume on the hepatic zebra pattern seen at computed tomographic (CT) arterial portography. MATERIALS AND METHODS: Images from CT arterial portographic examinations, performed via ei ...
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Journal ArticleRadiology · April 1997
Fine-needle aspiration (FNA) is increasing in popularity as a means of diagnosing mass lesions in intraabdominal organs. With use of radiologic guidance for needle placement, this technique is an effective way to obtain diagnostic material. In selected ins ...
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Journal ArticleRadiology · March 1997
PURPOSE: To describe the intrinsic sampling variability of measurements of portal venous flow in healthy volunteers and to estimate the variability attributable to the sonographer, the subject, and the measurement. MATERIALS AND METHODS: In a randomized co ...
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Journal ArticleRadiology · March 1997
PURPOSE: To compare dynamic gadolinium-enhanced with unenhanced magnetic resonance (MR) imaging in detection of liver metastases. MATERIALS AND METHODS: Two groups of patients were prospectively examined with unenhanced and dynamic gadolinium-enhanced MR i ...
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Journal ArticleJ Comput Assist Tomogr · 1997
PURPOSE: Our goal was to compare noncontrast phase (NCP), hepatic arterial phase (HAP), and portal venous phase (PVP) helical CT for the detection of focal liver lesions in patients at risk for having metastases from breast carcinoma. METHOD: Eighty-four c ...
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Journal ArticleRadiographics · November 1996
Because most radiologists in the United States have been taught that fluoroscopy and computed tomography (CT) are the best guidance techniques for nonvascular interventional procedures, sonography has been greatly underused in this regard. Recently, sonogr ...
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Journal ArticleRadiology · September 1996
PURPOSE: To determine the intrinsic sampling variability of measurements of hepatic artery resistive index and systolic acceleration time in healthy subjects and to estimate the components of variability attributable to the sonographer, individual measurem ...
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Journal ArticleAJR Am J Roentgenol · June 1996
OBJECTIVE: Dual-phase dynamic helical CT is now being used to detect and characterize benign and malignant hypervascular lesions in the liver. The purpose of this study is to define the timing and degree of parenchymal enhancement of normal liver during th ...
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Journal ArticleRadiology · June 1996
PURPOSE: To determine whether the diagnostic quality of computed tomography (CT) during arterial portography (CTAP) performed via the splenic artery (SA) is better than that performed via the superior mesenteric artery (SMA). MATERIALS AND METHODS: The aut ...
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Journal ArticleAcad Radiol · March 1996
RATIONALE AND OBJECTIVES: To control costs, it is increasingly important to make efficient use of imaging technology. We sought to determine and analyze the time required to complete each step of a body computed tomography (CT) scan, focusing on factors th ...
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Journal ArticleJ Magn Reson Imaging · 1996
To compare liver lesion detection rates, tissue signal and noise data, and qualitative parameters for breath-hold (BH) and non-breath-hold (NBH) hybrid rapid acquisition with relaxation enhancement (RARE) and conventional spin-echo (CSE) T2-weighted (CSE-T ...
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Journal ArticleGastrointestinal Endoscopy · January 1, 1996
Introduction: Magnetic Resonance Cholangiopancreatography (MRCP) is a novel application of MRI which may replace diagnostic ERCP in many cases. The indications for and diagnostic yield of MRCP remain to be elucidated. We performed a comparison of MRCP and ...
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Journal ArticleAJR Am J Roentgenol · August 1995
OBJECTIVE: The primary antiphospholipid syndrome consists of recurrent thromboses, early stroke, recurrent fetal loss, and livedo reticularis in patients with antiphospholipid antibodies and without systemic lupus erythematosus. The purpose of this study w ...
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Journal ArticleAJR Am J Roentgenol · August 1995
OBJECTIVE: The purpose of this study was to correlate a new three-dimensional turbo spin-echo MR cholangiopancreatography technique with endoscopic cholangiopancreatography or percutaneous cholangiography to determine the efficacy of the new technique for ...
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Journal ArticleAJR Am J Roentgenol · March 1995
Advances in organ procurement and surgical techniques have made orthotopic liver transplantation (OLT) an accepted treatment for many adult patients with end-stage hepatic disease. At present, OLT is being performed in patients with a variety of diseases, ...
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Journal ArticleJ Vasc Interv Radiol · 1995
PURPOSE: To evaluate a nonsurgical, nonhormonal sterilization procedure performed with use of transvaginal microcatheterization techniques and methyl cyanoacrylate (MCA) as a sclerosing agent MATERIALS AND METHODS: Seventeen adult virgin female rabbits und ...
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Journal ArticleAbdominal Imaging · 1995
Background: Imaging of peritoneal carcinomatosis is a well-known problem even for technologies as recent as computed tomography (CT). The purpose of this study was to evaluate whether CT performed after induced pneumoperitoneum (CT-PP) could have a higher ...
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Journal ArticleAJR Am J Roentgenol · July 1994
OBJECTIVE: Despite studies showing increased survival rates for patients after surgical resection of hepatic metastases, recurrences occur in 75% of treated patients. The purpose of this study was to determine the location and time of discovery of recurren ...
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Journal ArticleAJR Am J Roentgenol · July 1994
OBJECTIVE: The purpose of this study was to determine the value of MR imaging with a silicone-selective pulse sequence for detecting leakage from silicone breast implants. SUBJECTS AND METHODS: Women with silicone breast implants were referred for this stu ...
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Journal ArticleAJR Am J Roentgenol · July 1994
OBJECTIVE: Spiral CT allows rapid hepatic imaging during a single breath-hold. The increase in imaging speed potentially allows contrast material to be used more efficaciously than with conventional dynamic CT, perhaps allowing a decrease in the volume of ...
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Journal ArticleJ Magn Reson Imaging · 1994
The enhancement characteristics of the liver and spleen produced by a hepatocyte-specific magnetic resonance imaging agent, an arabinogalactan-coated ultrasmall superparamagnetic iron oxide derivative, BMS 180550, were evaluated. Both heavily T1- and T2-we ...
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Journal ArticleRadiology · November 1993
PURPOSE: To determine whether the addition of computed tomographic (CT) angiography to CT arterial portography would improve lesion detection and heighten confidence in interpreting perfusion abnormalities. MATERIALS AND METHODS: The two examinations were ...
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Journal ArticleAJR Am J Roentgenol · September 1993
OBJECTIVE: The purpose of this study was to determine if the Doppler sonographic finding of hepatopetal flow in the splenic vein that exceeds hepatopetal flow in the portal vein is associated with portosystemic varices. MATERIALS AND METHODS: Sixty-four pa ...
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Journal ArticleInvest Radiol · April 1993
RATIONALE AND OBJECTIVES: The authors assess performing hepatic magnetic resonance imaging (MRI) after arterial portography with manganese dipyridoxal diphosphate (MnD-PDP), a hepatobiliary contrast agent, as an invasive but potentially highly sensitive me ...
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Journal ArticleAbdom Imaging · 1993
Forty-three patients who were scheduled to undergo a percutaneous liver biopsy were evaluated with Doppler sonography to determine the hepatic arterial resistive index (RI). The histologic specimens were graded by a pathologist regarding cirrhosis and infl ...
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Journal ArticleJ Magn Reson Imaging · 1993
The lack of an adequately sensitive method for detecting silicone leakage and reported serious complications due to silicone leakage were cited as justification by the U.S. Food and Drug Administration for imposing the current restrictions on silicone gel- ...
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Journal ArticleMagn Reson Imaging · 1993
BMS 180549 (previously AMI-227), an ultrasmall superparamagnetic iron particulate agent, was investigated to determine its utility as a contrast agent on T1-weighted, as well as T2-weighted sequences, as a function of route of administration, (intravenous ...
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Journal ArticleJ Magn Reson Imaging · 1993
Magnetic resonance (MR) imaging methods with good spatial and contrast resolution are often too slow to follow the uptake of contrast agents with the desired temporal resolution. Imaging can be accelerated by skipping the acquisition of data normally taken ...
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Journal ArticleAJR Am J Roentgenol · August 1992
OBJECTIVE: The appearances of portosystemic collaterals and splenomegaly on CT before and after liver transplantation were evaluated. MATERIALS AND METHODS: The records of 54 patients undergoing liver transplantation during a 2.5-year period were reviewed ...
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Journal ArticleRadiographics · July 1992
Computed tomography (CT) during arterial portography (CTAP) is an important technique for evaluating the liver before hepatic tumor resection. With this technique, most tumors are of low attenuation compared with that of enhancing parenchyma. At times, low ...
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Journal ArticleAJR Am J Roentgenol · March 1992
The purpose of our study was to determine the frequency of detection of small hepatic lesions (less than or equal to 15 mm) in outpatients who had abdominal CT and to assess the significance of these lesions in the presence or absence of known malignant tu ...
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Journal ArticleRadiology · January 1992
Thirty-five abdominal computed tomographic (CT) scans of 27 patients with peritoneal metastases from a mucin-producing tumor of the appendix, colon, small bowel, or ovary were retrospectively reviewed. Fifteen scans were obtained of 15 patients after CT wi ...
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Journal ArticleGastrointest Radiol · 1992
We have developed a rapidly acquired T1-weighted spin-echo pulse sequence that uses gradient echo-like parameters of TR 70 ms, TE 10 ms, NEX-1 (SE 70/10/1) with large pulse angles, and presaturation. This sequence yields two images of the abdomen during a ...
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Journal ArticleJ Stone Dis · January 1992
Transcutaneous electrical nerve stimulation (TENS) has been suggested as a means to reduce the amount of intravenous analgesia/sedation in patients undergoing extracorporeal shock wave lithotripsy (ESWL). A retrospective analysis of 79 ESWL procedures on 7 ...
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Journal ArticleAmerican Journal of Roentgenology · 1992
The purpose of our study was to determine the frequency of detection of small hepatic lesions (≤15 mm) in outpatients who had abdominal CT and to assess the significance of these lesions in the presence or absence of known malignant tumors. Contrast-enhanc ...
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Journal ArticleRadiol Clin North Am · November 1991
We recommend that the CT technique of choice for routine screening of the liver, especially when there is potential for neoplasia, is dynamic CT using a single monophasic bolus of not less than 150 mL of a 60% iodinated contrast agent and a dynamic increme ...
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Journal ArticleInvest Radiol · July 1991
Both ultrasonography (US) and oral cholecystography (OCG) are being used to evaluate patients after extracorporeal shock wave lithotripsy (ESWL) for gallstones. Criteria for retreatment after the initial ESWL are usually related to the size of the residual ...
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Journal ArticleInvest Radiol · June 1991
We used an animal model to investigate the hepatic enhancement characteristics of manganese dipyridoxyl diphosphate (MnDPDP) related to time, dose, and pulse sequence. The contrast doses selected were in the human tolerance range. Using an SE 300/15 pulse ...
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Journal ArticleRadiology · June 1991
At the authors' institution, as part of the on-going Dornier National Biliary Lithotripsy Study, 174 patients with gallstones were randomly assigned to receive either ursodeoxycholic acid (UDCA) or placebo for 6 months after undergoing extracorporeal shock ...
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Journal ArticleRadiology · May 1991
The authors evaluated the safety and efficacy of a biopsy gun for performance of image-guided percutaneous biopsy of hepatic allografts in liver transplant recipients. Two hundred fifty-two liver biopsies were performed in 58 transplant recipients over a 2 ...
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Journal ArticleRadiology · February 1991
The enhancement characteristics in different portions of the liver during dynamic sequential bolus computed tomography (CT) with iodinated contrast material (DSBCT) were prospectively evaluated in 75 patients by using iothalamate meglumine, iopamidol, and ...
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Journal ArticleRadiology · February 1991
A study of biliary shock wave lithotripsy of gallstones sponsored by Dornier Medical Systems, Munich, began in the United States in May 1988 to evaluate the efficacy and safety of extracorporeal shock wave lithotripsy (ESWL) and the need for adjunctive the ...
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Journal ArticleGastrointest Radiol · 1991
Gadolinium (Gd)-DTPA was evaluated as a contrast agent for magnetic resonance (MR) imaging of the pancreas at 1.5T. Twenty-five patients were imaged with identical gradient-echo (GE) (TR 47, TE 13, 80 degree pulse angle) and spin-echo (SE) (TR 300, TE 15) ...
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Journal ArticleJournal of Diagnostic Medical Sonography · January 1, 1991
Multiple allograft duplex sonographic examinations were performed on six patients who underwent pancreas transplantation to determine the role of this imaging modality. Poor correlation was found between gland size, parenchymal echogenicity or resistive in ...
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Journal ArticleRadiology · November 1990
The relationship between gallstone fragmentation during extracorporeal shock wave lithotripsy (ESWL) and gallstone volume is poorly understood. Clinical results of ESWL show that the highest stone-free rate at 6 months occurs with radiolucent single gallst ...
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Journal ArticleSurg Gynecol Obstet · September 1990
Surgical treatment has proved to be of benefit to patients with primary and metastatic tumors of the liver. However, the ability to localize tumors preoperatively to particular segments within the liver has not been emphasized. The large size of this organ ...
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Journal ArticleRadiology · July 1990
The authors retrospectively studied 36 hepatic masses in 20 patients who underwent computed tomography during arterial portography (CTAP) and subsequent hepatic tumor resection. The authors used the right main and left main portal veins as landmarks for th ...
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Journal ArticleAJR Am J Roentgenol · February 1990
We evaluated 30 gallstone lithotripsy procedures performed on 27 patients with the Dornier MPL-9000 Lithotripter to determine how time was spent in the lithotripsy suite and to evaluate the various technical reasons for interrupting the administration of s ...
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Journal ArticleGastrointest Radiol · 1990
The diagnostic efficacy of magnetic resonance (MR) and computed tomography (CT) for detection and quantification of hepatic iron was assessed in a series of patients under investigation for clinical or biochemical evidence of hepatic iron overload. Thirty ...
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Journal ArticleAJR Am J Roentgenol · December 1989
In seven (18%) of 39 liver transplantation patients, serial Doppler sonographic examinations performed in the first 2 weeks after the transplantation showed transient, highly echogenic nonshadowing particles moving within the portal vein, believed to be po ...
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Journal ArticleAJR Am J Roentgenol · November 1989
We conducted a randomized, blinded, prospective study evaluating hepatic parenchymal density changes during dynamic bolus CT (180 ml of contrast material given IV) and delayed CT (5 hr after 60 g of iodine) in order to compare the enhancement characteristi ...
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Journal ArticleMed Clin North Am · November 1989
Aging is multifactorial and is dependent on genetic, life-style, and environmental factors. Successful aging relies upon a nutritionally complete diet and adequate exercise to counteract some of the physiologic changes related to age. A nutritionally sound ...
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Journal ArticleInvest Radiol · November 1989
Inability to demonstrate the renal corticomedullary junction (CMJ) on magnetic resonance (MR) images has been reported in connection with several medical renal diseases. T1-weighted spin echo pulse sequences have been advocated to demonstrate a signal inte ...
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Journal ArticleInvest Radiol · November 1989
We describe a hand-held electronic teaching-aid for magnetic resonance imaging (MRI), which can be used to demonstrate the dependence of signal intensity on changing pulse sequence parameters (TR and TE), the dependence of intensity on changing tissue para ...
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Journal ArticleRadiology · July 1989
Forty-three patients with known primary or secondary neoplastic involvement of the liver underwent evaluation to determine the number, size, and location of focal lesions before possible tumor resection. Imaging studies included computed tomography (CT) du ...
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Journal ArticleGastrointest Radiol · 1989
The magnetic resonance (MR) appearance of the liver in hemochromatosis has been previously described. We report a case in which iron deposition in the pancreas, spleen, and lymph nodes is demonstrated by MR. ...
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Journal ArticleMagn Reson Imaging · 1989
In an effort to determine whether T2 values of liver and muscle change with increasing field strength, 144 abdominal MR examinations were retrospectively evaluated. These patients were evaluated with a dual echo T2-weighted spin-echo sequence. Eighty-two o ...
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Journal ArticleInvest Radiol · July 1988
Magnetic resonance imaging of the liver was performed on 11 rabbits (3-5 kg) before and at 4, 5 and 6 hours after the intravenous administration of 0.3 mM/kg Gadolinium-diethylenetriamine pentaacetic acid (Gd-DTPA) to determine if hepatocytes exhibit delay ...
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Journal ArticleRadiology · July 1988
A prospective multiinstitutional study was performed to compare the ability of dynamic sequential contrast material-enhanced computed tomography (CT), delayed contrast material-enhanced CT, and two T1-weighted magnetic resonance (MR) sequences (spin echo a ...
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Journal ArticleRadiology · February 1988
The ability of a T1-weighted spin-echo magnetic resonance (MR) sequence to allow differentiation of benign from malignant adrenal masses at 0.5 T was investigated in 28 patients with 35 adrenal masses. All nine lesions with an adrenal mass-liver signal int ...
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Journal ArticleGastrointest Radiol · 1988
Eighteen patients with focal hepatic lesions were evaluated with two computed tomographic (CT) techniques including dynamic sequential bolus contrast CT and delayed contrast CT, and 3 magnetic resonance (MR) techniques including a spin echo pulse sequence ...
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Journal ArticleBiol Cybern · 1988
A theory is developed for determining the motion of an observer given the motion field over a full 360 degree image sphere. The method is based on the fact that for an observer translating without rotation, the projected circular motion field about any equ ...
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Journal ArticleGastrointest Radiol · 1988
One hundred patients with cirrhosis underwent abdominal computed tomography (CT) using a delayed contrast technique to determine liver and spleen volume. These scans were reviewed to screen this "at risk" population for hepatocellular carcinoma (HCC). Fift ...
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Journal ArticleAnn Surg · November 1987
Magnetic resonance imaging (MRI) was performed on 16 muscle flaps and eight jejunal segments in dogs to assess its usefulness in detecting vascular occlusion. Arterial or venous occlusion was carried out in 11 muscles and six bowel segments, with the remai ...
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Journal ArticleDrug Intell Clin Pharm · September 1987
Seventeen nursing home residents with sleeping problems were enrolled in a randomized, double-blind, crossover trial of temazepam 15 mg, diphenhydramine (DPH) 50 mg, and placebo. Each drug was given for five consecutive nights with a 72-hour washout period ...
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Journal ArticleAJR Am J Roentgenol · July 1987
Pulsed Doppler sonography and liver panangiography were performed in 43 patients with cirrhosis. Fourteen patients were evaluated preoperatively, and 28 patients were evaluated after a variceal decompressive shunt. One patient was studied before and after ...
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Journal ArticleRadiology · May 1987
The occurrence of changes in the kidneys after extracorporeal shock wave lithotripsy (ESWL) was evaluated with magnetic resonance (MR) imaging in 34 patients, utilizing T1-weighted spin-echo pulse sequences. Five of the 34 patients underwent bilateral ESWL ...
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Journal ArticleRadiology · February 1987
A prospective study compared the efficacy of Doppler ultrasonography (US) and magnetic resonance (MR) imaging in evaluating 38 renal allografts, with specific attention to transplant rejection. Forty-three Doppler US and 42 MR examinations were performed a ...
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Journal ArticleJ Comput Assist Tomogr · 1987
We describe how the artifact caused by eddy currents generated in free standing copper coils may be controlled and used to advantage in magnetic resonance (MR) imaging. The eddy currents distort the excitation field of the MR imager in the vicinity of the ...
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Journal ArticlePublic Health Rep · 1987
An epidemic of abuse with "T's and blues" began in the late 1970's in which pentazocine-Talwin tablets ("T")--and the antihistamine tripelennamine (known as blues) were crushed, dissolved together, filtered, and injected intravenously. The resulting high w ...
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Journal ArticleAJR Am J Roentgenol · November 1986
Fifty-six MR studies were obtained in 32 renal transplant patients, by using T1-weighted, spin-echo, and inversion-recovery pulse sequences. The findings, particularly the loss of corticomedullary differentiation, and the extent of vascular penetration int ...
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Journal ArticleRadiology · September 1983
Anterior and inversion stress were applied to the lateral ligaments of the ankle and the findings compared with the arthrograms. Fifty-five patients underwent stress radiography of both ankles and arthrography of the injured ankle within 72 hours of acute ...
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Journal ArticleAntimicrob Agents Chemother · June 1983
(E)-5-(2-Bromovinyl)-2'-deoxyuridine (BVdU) was phosphorylated by the bovine herpesvirus 1 (BHV-1)-induced thymidine kinase and subsequently incorporated into viral DNA, resulting in DNA that was more dense than DNA from untreated cells. Incorporation of t ...
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Journal ArticleOral Surg Oral Med Oral Pathol · February 1983
This study evaluates the effect of cyclic autoclave sterilization and simulated clinical usage on a mechanical property of one brand of stainless steel endodontic files. The angular deflection moments were measured by a torque apparatus approved by the Ame ...
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