David Bradway

Conference IEEE International Ultrasonics Symposium Ius · January 1, 2025 We present a volumetric characterization method for 3D-RSWEI data in in vivo skeletal muscle, in which shear wave speeds (SWS) are quantified at multiple rotational angles through multiple axial depths within the depth-of-field. We have shown in the vastus ... Full text Cite

Characterization of Anisotropic Lattice Structured Phantoms Using 3D-Rotational Shear Wave Elasticity Imaging (3D-RSWEI)

Conference IEEE Ultrasonics Ferroelectrics and Frequency Control Joint Symposium Uffc Js 2024 Proceedings · January 1, 2024 We present a 3D-RSWEI characterization of anisotropic lattice phantoms. Shear wave speeds versus rotational angle were measured while the lattices were submerged in water and after embedding in a softer, isotropic polyvinyl alcohol cryogel. In both cases, ... Full text Cite

Mechanisms affecting ALARA MI selected in adaptive ultrasound imaging

Conference IEEE International Ultrasonics Symposium Ius · January 1, 2021 Adaptive acoustic output selection in ultrasound imaging promises to improve adherence to the ALARA (as low as reasonably achievable) principle. Demonstrated imaging sequences have balanced image quality and safety considerations based on transducer channe ... Full text Cite

Force-Map Normalization for ARFI Imaging

Conference IEEE International Ultrasonics Symposium Ius · October 1, 2019 Acoustic Radiation Force Impulse (ARFI) images are used to visualize spatial variations in soft tissue elasticity by showing the displacement of each pixel in response to an applied radiation force. However, accommodations for spatial variations in the app ... Full text Cite

Implementation and Clinical Evaluation of a Fetal ALARA Ultrasound System

Conference IEEE International Ultrasonics Symposium Ius · December 17, 2018 The US Food and Drug Administration (FDA) provides guidelines for acoustic output to ensure that ultrasound remains a safe imaging modality used widely in applications such as obstetrics. However, even within these limits, additional acoustic output that d ... Full text Cite

The Ultrasound File Format (UFF) - First Draft

Conference IEEE International Ultrasonics Symposium Ius · January 1, 2018 The lack of a standard format for storing ultrasound research data is hindering our ability to share and compare research results. This is slowing down the progress in our field, making it difficult to assess the relevance of new techniques. In October 201 ... Full text Cite

Notice of Removal: Translation of fetal short-lag spatial coherence (SLSC) imaging into clinical practice: A pilot study

Conference IEEE International Ultrasonics Symposium Ius · October 31, 2017 Fetal short-lag spatial coherence (SLSC) imaging has demonstrated 64-85% increases in CNR and 17-29% increases in contrast relative to conventional B-mode imaging. However, despite its proven technical efficacy, the viability of fetal SLSC in the clinical ... Full text Cite

Notice of Removal: Clinical feasibility of a noninvasive method to interrogate myocardial function via strain and acoustic radiation force-derived stiffness

Conference IEEE International Ultrasonics Symposium Ius · October 31, 2017 Myocardial elastance, derived from pressure-volume (PV) loops in the left ventricle (LV), can be used to assess LV function and myocardial performance. This method requires an invasive intracardiac pressure-volume catheter to be inserted in the LV, limitin ... Full text Cite

Single track location comb-push ultrasound shear elastography (STL-CUSE)

Conference IEEE International Ultrasonics Symposium Ius · October 31, 2017 Single Track Location Shear Wave Elasticity Imaging (STL-SWEI) creates high resolution shear wave speed maps by comparing the tissue motion at each tracking location between spatially-offset radiation force excitations. While STL-SWEI circumvents the resol ... Full text Cite

Single track location Comb-Push Ultrasound Shear Elastography (STL-CUSE)

Conference IEEE International Ultrasonics Symposium Ius · October 31, 2017 Comb-Push Ultrasound Shear Elastography (CUSE) uses ultrasound beams focused simultaneously at multiple laterally-offset positions to induce shear waves in tissue, and uses the local propagation of the waves to estimate tissue elasticity everywhere in the ... Full text Cite

In vivo transthoracic measurements of acoustic radiation force induced displacements in the heart over the cardiac cycle

Conference 2015 IEEE International Ultrasonics Symposium Ius 2015 · November 13, 2015 Myocardial elasticity is an important indicator of cardiac function and is affected in many disorders associated with heart failure. Ultrasound based interrogation of cardiac stiffness has been extensively studied in ex-vivo, open chest and intracardiac im ... Full text Cite

Phantom and in vivo demonstration of swept synthetic aperture imaging

Conference 2015 IEEE International Ultrasonics Symposium Ius 2015 · November 13, 2015 Ultrasound imaging of deep abdominal targets suffers from low lateral resolution due to limited aperture size and low-frequency transmit pulses. We demonstrate phantom and in vivo imaging results using a device that allows a tracked mechanical sweep of a c ... Full text Cite

Transverse oscillation vector flow imaging for transthoracic echocardiography

Conference Progress in Biomedical Optics and Imaging Proceedings of SPIE · January 1, 2015 This work presents the development and first results of in vivo transthoracic cardiac imaging using an implementation of Vector Flow Imaging (VFI) via the Transverse Oscillation (TO) method on a phased-array transducer. Optimal selection of the lateral wav ... Full text Cite

Real-time GPU implementation of transverse oscillation vector velocity flow imaging

Conference Progress in Biomedical Optics and Imaging Proceedings of SPIE · January 1, 2014 Rapid estimation of blood velocity and visualization of complex flow patterns are important for clinical use of diagnostic ultrasound. This paper presents real-time processing for two-dimensional (2-D) vector flow imaging which utilizes an off-the-shelf gr ... Full text Cite

Acoustic radiation force impulse imaging on an IVUS circular array

Conference IEEE International Ultrasonics Symposium Ius · December 1, 2013 Our long-term goal is the detection and characterization of vulnerable plaque in the coronary arteries of the heart using IVUS catheters. Vulnerable plaque, characterized by a thin fibrous cap and a soft, lipid-rich, necrotic core is a pre-cursor to heart ... Full text Cite

NOVEL APPLICATION OF ACOUSTIC RADIATION FORCE IMPULSE IMAGING IN TRANSTHORACIC ECHOCARDIOGRAPHY

Conference Journal of the American College of Cardiology · March 2013 Full text Cite

Confirmation of cardiac radiofrequency ablation treatment using intra-procedure acoustic radiation force impulse imaging

Conference IEEE International Ultrasonics Symposium Ius · December 1, 2012 Recurrence of atrial fibrillation after transcatheter ablation (TCA) is common because there is no imaging modality that can visually confirm the presence of radiofrequency ablation (RFA) lesions. We have previously shown that acoustic radiation force impu ... Full text Cite

Feasibility and safety of transthoracic cardiac acoustic radiation force impulse imaging methods

Conference IEEE International Ultrasonics Symposium Ius · December 1, 2012 This work examines clinical feasibility of using non-invasive transthoracic echocardiography techniques to visualize temporal variations of stiffness through the cardiac cycle using acoustic radiation force impulse (ARFI) imaging. © 2012 IEEE. ... Full text Cite

Intracardiac ARF-driven shear wave velocimetry to estimate regional myocardial stiffness and contractility in pigs with focal infarctions

Conference IEEE International Ultrasonics Symposium Ius · December 1, 2012 Four pigs, three with focal infarctions in the apical intraventricular septum (IVS) and/or left ventricular free wall (LVFW), were imaged with an intracardiac echocardiography (ICE) transducer. Custom beam sequences were used to excite the myocardium with ... Full text Cite

Direct in vivo myocardial infarct visualization using 3D ultrasound and passive strain contrast

Conference IEEE International Ultrasonics Symposium Ius · December 1, 2011 An approach for myocardial elastography is presented for infarct visualization. Infarcts are visualized using passive strain in the ventricles induced by atrial contraction. Results are compared against ARFI and delay-enhanced contrast MR. © 2011 IEEE. ... Full text Cite

Parametric pressure-volume analysis and acoustic radiation force impulse imaging of left ventricular function

Conference Proceedings IEEE Ultrasonics Symposium · December 1, 2010 Extensive research has been devoted to the quantification of left ventricular (LV) function via an elasticity metric known as elastance. Similar to a stress-strain relation, yielding stiffness, myocardial elastance is measured from the pressure-volume (PV) ... Full text Cite

Transthoracic cardiac acoustic radiation force impulse imaging: A feasibility study

Conference Proceedings IEEE Ultrasonics Symposium · December 1, 2007 We describe new non-invasive techniques for visualizing local variations of stiffness in cardiac tissue through the use of transthoracic acoustic radiation force impulse (ARFI) imaging. Custom M-mode and two-dimensional ARFI sequences were implemented on t ... Full text Cite

In vivo Acoustic Radiation Force Impulse imaging of abdominal lesions

Conference Proceedings 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 ... Full text Cite

Ivory Towers

Conference In Hollywood, there is a game and computer science problem known as the "Six Degrees of Kevin Bacon" in which almost any actor can be linked to Kevin Bacon through a number of movies and other actors. For most actors the number of links is less than 6, and ... Open Access Cite