Jennifer Colleen O'Daniel

Journal article Med Phys · January 2025 BACKGROUND: The Joint AAPM-ESTRO TG-360 is developing a quantitative framework to evaluate treatment verification systems used for patient-specific quality assurance (PSQA). A subgroup was commissioned to determine which potential failure modes had the gre ... Full text Link to item Cite

A structured FMEA approach to optimizing combinations of plan-specific quality assurance techniques for IMRT and VMAT QA.

Journal article Med Phys · September 2023 BACKGROUND: Many commercial tools are available for plan-specific quality assurance (QA) of radiotherapy plans, with their functionality assessed in isolation. However, multiple QA tools are required to review the full range of potential errors. It is impo ... Full text Link to item Cite

AAPM TG 191: Clinical use of luminescent dosimeters: TLDs and OSLDs.

Journal article Med Phys · February 2020 Thermoluminescent dosimeters (TLD) and optically stimulated luminescent dosimeters (OSLD) are practical, accurate, and precise tools for point dosimetry in medical physics applications. The charges of Task Group 191 were to detail the methodologies for pra ... Full text Link to item Cite

Accuracy and efficiency of image-guided radiation therapy (IGRT) for preoperative partial breast radiosurgery.

Journal article J Radiosurg SBRT · 2020 OBJECTIVE: To analyze and evaluate accuracy and efficiency of IGRT process for preoperative partial breast radiosurgery. METHODS: Patients were initially setup with skin marks and 5 steps were performed: (1) Initial orthogonal 2D kV images, (2) pre-treatme ... Open Access Link to item Cite

Quantitative Approach to Failure Mode and Effect Analysis for Linear Accelerator Quality Assurance.

Journal article Int J Radiat Oncol Biol Phys · May 1, 2017 PURPOSE: To determine clinic-specific linear accelerator quality assurance (QA) TG-142 test frequencies, to maximize physicist time efficiency and patient treatment quality. METHODS AND MATERIALS: A novel quantitative approach to failure mode and effect an ... Full text Link to item Cite

Diode-based transmission detector for IMRT delivery monitoring: a validation study.

Journal article J Appl Clin Med Phys · September 8, 2016 The purpose of this work was to evaluate the potential of a new transmission detector for real-time quality assurance of dynamic-MLC-based radiotherapy. The accuracy of detecting dose variation and static/dynamic MLC position deviations was measured, as we ... Full text Open Access Link to item Cite

Diode-based transmission detector for IMRT delivery monitoring: a validation study.

Journal article J Appl Clin Med Phys · September 2016 The purpose of this work was to evaluate the potential of a new transmission detector for real-time quality assurance of dynamic-MLC-based radiotherapy. The accuracy of detecting dose variation and static/dynamic MLC position deviations was measured, as we ... Full text Link to item Cite

Comparison of 2D and 3D gamma analyses.

Journal article Med Phys · February 2014 PURPOSE: As clinics begin to use 3D metrics for intensity-modulated radiation therapy (IMRT) quality assurance, it must be noted that these metrics will often produce results different from those produced by their 2D counterparts. 3D and 2D gamma analyses ... Full text Link to item Cite

Investigation of sliced body volume (SBV) as respiratory surrogate.

Journal article J Appl Clin Med Phys · January 7, 2013 The purpose of this study was to evaluate the sliced body volume (SBV) as a respiratory surrogate by comparing with the real-time position management (RPM) in phantom and patient cases. Using the SBV surrogate, breathing signals were extracted from unsorte ... Full text Open Access Link to item Cite

Investigation of sliced body volume (SBV) as respiratory surrogate

Journal article Journal of Applied Clinical Medical Physics · January 1, 2013 The purpose of this study was to evaluate the sliced body volume (SBV) as a respiratory surrogate by comparing with the real-time position management (RPM) in phantom and patient cases. Using the SBV surrogate, breathing signals were extracted from unsorte ... Full text Cite

Point/counterpoint: TG-142 is unwarranted for IGRT QA.

Journal article Med Phys · January 2013 Full text Link to item Cite

A quality assurance method that utilizes 3D dosimetry and facilitates clinical interpretation.

Journal article Int J Radiat Oncol Biol Phys · October 1, 2012 Featured Publication PURPOSE: To demonstrate a new three-dimensional (3D) quality assurance (QA) method that provides comprehensive dosimetry verification and facilitates evaluation of the clinical significance of QA data acquired in a phantom. Also to apply the method to inve ... Full text Link to item Cite

Comparison of 3D conformal breast radiation treatment plans using the anisotropic analytical algorithm and pencil beam convolution algorithm.

Journal article Radiother Oncol · May 2012 PURPOSE: To investigate (1) dosimetric differences between plans calculated using the anisotropic analytical algorithm (AAA) and pencil beam convolution (PBC) algorithm, (2) the plan quality achieved using AAA compared to PBC based on dosimetric parameters ... Full text Link to item Cite

Volumetric-modulated arc therapy: effective and efficient end-to-end patient-specific quality assurance.

Journal article Int J Radiat Oncol Biol Phys · April 1, 2012 Featured Publication PURPOSE: To explore an effective and efficient end-to-end patient-specific quality-assurance (QA) protocol for volumetric modulated arc radiotherapy (VMAT) and to evaluate the suitability of a stationary radiotherapy QA device (two-dimensional [2D] ion cha ... Full text Link to item Cite

Adaptive radiation therapy: technical components and clinical applications.

Journal article Cancer J · 2011 In current standard radiation therapy process, patient anatomy is represented by the snapshot of computed tomographic images at the simulation for treatment planning. However, patient anatomy during the treatment course is not static, and the changes can b ... Full text Link to item Cite

6D image guidance for spinal non-invasive stereotactic body radiation therapy: Comparison between ExacTrac X-ray 6D with kilo-voltage cone-beam CT.

Journal article Radiother Oncol · April 2010 PURPOSE: To investigate setup discrepancies measured with ExacTrac X-ray 6 degree-of-freedom (6D) and cone-beam computed tomography (CBCT) for patients under treatments of stereotactic body radiation therapy (SBRT). MATERIALS AND METHODS: In this work, pha ... Full text Link to item Cite

Patient specific quality assurance: Transition from IMRT to IMAT

Journal article Journal of Physics Conference Series · January 1, 2010 The purpose of this study was to test a patient-specific quality assurance (QA) protocol for intensity-modulated arc radiotherapy (IMAT), and to evaluate the use of an intensity-modulated stationary radiotherapy QA device (2D ion chamber array). Thirty-nin ... Full text Cite

Tradeoffs of integrating real-time tracking into IGRT for prostate cancer treatment.

Journal article Phys Med Biol · September 7, 2009 This study investigated the integration of the Calypso real-time tracking system, based on implanted ferromagnetic transponders and a detector array, into the current process for image-guided radiation treatment (IGRT) of prostate cancer at our institution ... Full text Link to item Cite

Performance evaluation of automatic anatomy segmentation algorithm on repeat or four-dimensional computed tomography images using deformable image registration method.

Journal article Int J Radiat Oncol Biol Phys · September 1, 2008 PURPOSE: Auto-propagation of anatomic regions of interest from the planning computed tomography (CT) scan to the daily CT is an essential step in image-guided adaptive radiotherapy. The goal of this study was to quantitatively evaluate the performance of t ... Full text Link to item Cite

Dosimetric effect of translational and rotational errors for patients undergoing image-guided stereotactic body radiotherapy for spinal metastases.

Journal article Int J Radiat Oncol Biol Phys · July 15, 2008 PURPOSE: To investigate the dosimetric effects of translational and rotational patient positioning errors on the treatment of spinal and paraspinal metastases using computed tomography image-guided stereotactic body radiotherapy. The results of this study ... Full text Link to item Cite

Quantification of prostate and seminal vesicle interfraction variation during IMRT.

Journal article Int J Radiat Oncol Biol Phys · July 1, 2008 PURPOSE: To quantify the interfraction variability in prostate and seminal vesicle (SV) positions during a course of intensity-modulated radiotherapy (IMRT) using an integrated computed tomography (CT)-linear accelerator system and to assess the impact of ... Full text Link to item Cite

Daily bone alignment with limited repeat CT correction rivals daily ultrasound alignment for prostate radiotherapy.

Journal article Int J Radiat Oncol Biol Phys · May 1, 2008 PURPOSE: To compare the effectiveness of daily ultrasound (US)- and computed tomography (CT)-guided alignments with an off-line correction protocol using daily bone alignment plus a correction factor for systematic internal prostate displacement (CF(ID)). ... Full text Link to item Cite

Parotid gland dose in intensity-modulated radiotherapy for head and neck cancer: is what you plan what you get?

Journal article Int J Radiat Oncol Biol Phys · November 15, 2007 PURPOSE: To quantify the differences between planned and delivered parotid gland and target doses, and to assess the benefits of daily bone alignment for head and neck cancer patients treated with intensity-modulated radiotherapy (IMRT). METHODS AND MATERI ... Full text Link to item Cite

Is a 3-mm intrafractional margin sufficient for daily image-guided intensity-modulated radiation therapy of prostate cancer?

Journal article Radiother Oncol · November 2007 PURPOSE: To determine whether a 3-mm isotropic target margin adequately covers the prostate and seminal vesicles (SVs) during administration of an intensity-modulated radiation therapy (IMRT) treatment fraction, assuming that daily image-guided setup is pe ... Full text Link to item Cite

The effect of dental artifacts, contrast media, and experience on interobserver contouring variations in head and neck anatomy.

Journal article Am J Clin Oncol · April 2007 OBJECTIVES: To investigate interobserver variability in the delineation of head-and-neck (H&N) anatomic structures on CT images, including the effects of image artifacts and observer experience. METHODS: Nine observers (7 radiation oncologists, 1 surgeon, ... Full text Link to item Cite

SU‐FF‐T‐102: Clinical Beam Tuning of Low‐Energy Electron Beams: Matching Varian and Siemens Linear Accelerators

Journal article Medical Physics · January 1, 2007 Purpose: Tuning nominal energies on linear accelerators is useful for matching machines of different vendors and for altering energies to match clinical needs. In this study we investigated matching a Varian 2100EX 4MeV electron beam to a Siemens Primus 5M ... Full text Cite

Dosimetric comparison of four target alignment methods for prostate cancer radiotherapy.

Journal article Int J Radiat Oncol Biol Phys · November 1, 2006 PURPOSE: The aim of this study was to compare the dosimetric consequences of 4 treatment delivery techniques for prostate cancer patients treated with intensity-modulated radiotherapy (IMRT). METHODS AND MATERIALS: During an 8-week course of radiotherapy, ... Full text Link to item Cite

A Monte Carlo based method to estimate radiation dose from multidetector CT (MDCT): cylindrical and anthropomorphic phantoms.

Journal article Phys Med Biol · September 7, 2005 The purpose of this work was to extend the verification of Monte Carlo based methods for estimating radiation dose in computed tomography (CT) exams beyond a single CT scanner to a multidetector CT (MDCT) scanner, and from cylindrical CTDI phantom measurem ... Full text Link to item Cite

Estimating surface radiation dose from Multidetector CT: Cylindrical phantoms, Anthropomorphic phantoms and Monte Carlo Simulations

Journal article Progress in Biomedical Optics and Imaging Proceedings of SPIE · August 25, 2005 Multidetector CT (MDCT) systems offer larger coverage and wider z-axis beams, resulting in larger cone angles. One impact on radiation dose is that while radiation profiles at isocenter are constant when contiguous axial scans are performed, the increased ... Full text Cite

Reducing radiation exposure from survey CT scans.

Journal article AJR Am J Roentgenol · August 2005 OBJECTIVE: The purpose of this study was to focus attention on the technique factors commonly used in survey CT scans (e.g., scout, topogram, or pilot scans) to measure the radiation exposure from typical survey CT scans, to compare their exposure to that ... Full text Link to item Cite

Validation of an accelerated 'demons' algorithm for deformable image registration in radiation therapy.

Journal article Phys Med Biol · June 21, 2005 A greyscale-based fully automatic deformable image registration algorithm, originally known as the 'demons' algorithm, was implemented for CT image-guided radiotherapy. We accelerated the algorithm by introducing an 'active force' along with an adaptive fo ... Full text Link to item Cite

Nonlinear magnetic diffusion in single-domain YBCO cylinders under pulsed field conditions

Journal article IEEE Transactions on Applied Superconductivity · June 1, 2005 A step-function increase in magnetic field has been applied to various single-domain Y-Ba-Cu-O rings and disks at 77 K. The magnetic field in the center of these structures exhibits an exponential approach to an equilibrium value, as predicted by simple di ... Full text Cite

An automatic CT-guided adaptive radiation therapy technique by online modification of multileaf collimator leaf positions for prostate cancer.

Journal article Int J Radiat Oncol Biol Phys · May 1, 2005 PURPOSE: To propose and evaluate online adaptive radiation therapy (ART) using in-room computed tomography (CT) imaging that detects changes in the target position and shape of the prostate and seminal vesicles (SVs) and then automatically modifies the mul ... Full text Link to item Cite

WE‐E‐T‐617‐02: Dosimetric Impact of Anatomic Variations for Head & Neck Cancer Patients Undergoing IMRT Treatment Analyzed by Deformable Imaging Registration

Journal article Medical Physics · January 1, 2005 Purpose: The anatomy in some head and neck cancer patients can vary significantly during the course of radiation therapy due to weight loss and/or tumor shrinkage. The purpose of this study is to investigate the dosimetric impact of such changes for patien ... Full text Cite

SU‐FF‐J‐55: Cumulative Dose Calculation Using Deformable Image Registration

Journal article Medical Physics · January 1, 2005 Purpose: To use deformable image registration to calculate cumulative dose distributions received by a radiotherapy patient in order to evaluate the dosimetric impact of anatomical variations during the course of treatment. Method and Materials: An intensi ... Full text Cite

SU‐CC‐J‐6C‐05: Intra‐Fractional Variations of Anatomy During IMRT Treatment of Prostate Cancer

Journal article Medical Physics · January 1, 2005 Purpose: The main goals of this study are to quantify the variations of pelvic anatomy during a single treatment fraction and to analyze the relationship of prostate and seminal vesicle (SV) motion relative to the bladder and rectum. Method and Materials: ... Full text Cite

SU‐FF‐J‐92: Dosimetric Comparison of Skin, Bone, Ultrasound, and CT Alignments for Prostate Cancer

Journal article Medical Physics · January 1, 2005 Purpose: To quantify the dosimetric impact of four alignment methods (skin marks, bone, ultrasound, and CT) on the daily treatment of prostate patients. Method and Materials: Six prostate patients received 3 CT scans per week immediately before treatment u ... Full text Cite

TU‐C‐J‐6B‐09: Automatic Contour Delineation On Subsequent CT Images Using Deformable Registration

Journal article Medical Physics · January 1, 2005 Purpose: To implement a deformable registration algorithm to automatically delineate regions of interest (ROIs) on daily CT images by transforming the corresponding ROIs from a reference CT image. Method and Materials: An intensity‐based ‘Demons’ deformabl ... Full text Cite

Quantification of volumetric and geometric changes occurring during fractionated radiotherapy for head-and-neck cancer using an integrated CT/linear accelerator system.

Journal article Int J Radiat Oncol Biol Phys · July 15, 2004 PURPOSE: Many patients receiving fractionated radiotherapy (RT) for head-and-neck cancer have marked anatomic changes during their course of treatment, including shrinking of the primary tumor or nodal masses, resolving postoperative changes/edema, and cha ... Full text Link to item Cite

Evaluation of a contour-alignment technique for CT-guided prostate radiotherapy: an intra- and interobserver study.

Journal article Int J Radiat Oncol Biol Phys · June 1, 2004 PURPOSE: The recent introduction of integrated CT/linear accelerator systems may mean that daily CT localization can become a reality in the clinic, possibly allowing further dose escalation to the prostate while limiting unwanted doses to the rectum and b ... Full text Link to item Cite

Strategies for formulating appropriate MDCT techniques when imaging the chest, abdomen, and pelvis in pediatric patients.

Journal article AJR Am J Roentgenol · April 2004 OBJECTIVE: Our aim was to formulate appropriate MDCT chest and abdominopelvic CT scan protocols for pediatric patients. MATERIALS AND METHODS: Surface radiation dose measurements from a set of anthropomorphic phantoms (nominal 1 year old, 5 year old, and 1 ... Full text Link to item Cite

The delivery of IMRT with a single physical modulator for multiple fields: a feasibility study for paranasal sinus cancer.

Journal article Int J Radiat Oncol Biol Phys · March 1, 2004 PURPOSE: This study describes a new intensity-modulated radiation therapy (IMRT) delivery method that utilizes a single modulator to deliver multiple fields ("multifield modulator"). This technique reduces the treatment time and manufacturing costs typical ... Full text Link to item Cite