Global ETD Search
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Showing 1 to 12 of 12 for “"Elasticity imaging"”.
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Ultrasound tissue displacement and tissue elasticity imaging
… ultrasound, to measure tissue motion and tissue elasticity for medical imaging applications. Ultrasound provides a means for non-invasive imaging of soft tissues, providing soft tissue contrast that cannot be achieved using conventional X-ray or tomographic imaging.
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A data-driven approach to quasi-static ultrasonic elasticity imaging
… ultrasonic elastography (QUSE) is one of several elasticity imaging techniques sensitive to mechanical contrast and offers a way to visualize the spatiotemporal distribution of material properties within tissues. Unfortunately, QUSE is generally an ill-posed inverse problem. Quantifying the …
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A 3-D Multiparametric Ultrasound Elasticity Imaging System for Targeted Prostate Biopsy Guidance
… goal of this work is to leverage ultrasound elasticity imaging methods, including acoustic radiation force impulse (ARFI) imaging and shear wave elasticity imaging (SWEI), to develop and optimize a robust 3-D elasticity imaging system for ultrasound-guided prostate biopsies and to quantify …
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Guiding the development of data-driven models to solve constitutive inverse problems in medical elasticity imaging
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms
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Combined ultrasound, photoacoustic and elasticity microscope for tissue engineers
… existing invasive methods like biopsy. Hence, an imaging tool for non-invasive and simultaneous evaluation of the anatomical and functional properties of the engineered tissue is needed. In this thesis, we present an advanced in-vivo imaging technology - ultrasound biomicroscopy combined with …
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Mapping Myocardial Elasticity with Intracardiac Acoustic Radiation Force Impulse Methods
… characterizing the heart's elastic properties. Elasticity imaging may be of benefit for diagnosis and characterization of infarction and heart failure, as well as for guidance of ablation therapy for the treatment of arrhythmias. This thesis tests the hypothesis that with appropriately designed …
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Model Reduction and Domain Decomposition Methods for Uncertainty Quantification
… strategy that is used in the context of elasticity imaging to infer the presence of an inclusion embedded in a soft matrix, mimicking tumors in soft tissues. The method relies on Polynomial Chaos (PC) expansions to build a dictionary of surrogates models, where each surrogate is …
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Quantitative estimates of mechanical properties from in vivo tumors of rodent animals
… assess the sensitivity for relating matrix viscoelasticity to tumor type and stage. Cylindrical, harmonic shear waves generated by a vibrating needle (50-450 Hz) were tracked by Doppler-ultrasound in vivo. Estimates of spatial-phase gradients yielded shear-speed dispersion curves that were fit to …
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Mechanical characterization of tissue-like materials using information based machine learning
… the sensitivity and specificity of existing imaging modalities. Current quantitative elasticity imaging methods rely on a priori assumptions of the tissue biomechanics in order to simply the forward problem, from which an inverse problem is developed. Erroneous assumptions and noisy image …
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Acoustic Radiation Force Impulse Imaging of Myocardial Performance
… Acoustic radiation force impulse (ARFI) imaging has been demonstrated to be capable of visualizing variations in local stiffness within soft tissue. </p><p>In this thesis, the initial investigations into the visualization of myocardial performance with ARFI imaging are presented. …
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Assessment of Cardiac Function by Acoustic Radiation Force (ARF) Based Methods of Ultrasound Elastography
… compliance. </p><p>These measures are based on imaging and include Ejection Fraction and Doppler and ultrasound strain imaging. These measurements are indirect measures that rely on cardiac motion or volume changes. The measurements are load dependent and could be affected by the heart rhythm …
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Identifying Vulnerable Plaques with Acoustic Radiation Force Impulse Imaging
… that Acoustic Radiation Force Impulse (ARFI) imaging can noninvasively identify lipid regions, that have been shown to increase a plaque's propensity to rupture, within carotid artery plaques <italic>in vivo</italic>. The work detailed herein describes development efforts and results from …