Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 34 for “"Tissue characterization"”.
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Quantitative biomarkers for tissue characterization
… quantitative techniques to characterize tissue. The primary metrics investigated include estimation of longitudinal speed of sound and shearwave elastography. Additional metrics investigated include bioimpedance and functional tests specifically for muscle health quantification. …
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Statistical methods in ultrasonic tissue characterization
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Multimodal Optical Imaging for Tissue Characterization and Disease Diagnosis
… diagnostic performance in identifying diseased tissue using texture features of OCT images. The third section details the application of MPM and wide-field fluorescence imaging using exogenous contrast agents to evaluate and classify tissue health. Two tissue studies using a mouse model of …
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Combined Microwave, Ultrasound and Strain Imaging for Breast Tissue Characterization
… elastic stiffness between tumours and normal tissues. Microwave imaging is an emerging modality that is appealing because it is low-cost and highly safe for patients, as it does not emit harmful radiation. A promising improvement in the field of breast cancer imaging is to utilize the imaging …
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MRI determined tissue characterization of myocardial infiltration and fibrosis in cardiomyopathy
Cardiac Magnetic Resonance Imaging (CMRI) is an important and valuable tool in the routine management of patients with cardiovascular disease. Contrast enhanced CMRI allows detection of ischemic and scarred myocardium, including rare infiltrative processes that cause cardiomyopathies. Amyloidosis …
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The Trapeziometacarpal Joint: Tissue Characterization and Surgical Techniques for Treatment of Osteoarthritis
… properties of the TMC joint and surrounding tissue is limited. The following research will seek to identify the ligamentous structures hypothesized to act as primary stabilizers of the TMC joint through advanced, high-resolution motion analyses. Mechanical properties of the primary …
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Diffusion Tensor Imaging and Quantitative Tractography of Skeletal Muscle for Microstructural Tissue Characterization
This thesis aims to investigate the use of magnetic resonance diffusion tensor imaging (DTI) as a non-invasive tool to study the structure and organization of human skeletal muscle. By analyzing the diffusion of water molecules, DTI can uniquely probe the microstructure of skeletal muscle providing …
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Kidney tissue characterization using magnetic resonance in HIV infected individuals undergoing kidney biopsy
BACKGROUND: Kidney disease is a common complication of human immunodeficiency virus (HIV) infection. Kidney biopsy is the gold standard for assessing causation, but being invasive, it carries increased risk in advanced chronic kidney disease (CKD). Magnetic resonance imaging (MRI) is noninvasive …
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Brain segmentation using endogenous contrast mechanism using breath holding fMRI signal for tissue characterization
… spatial resolution maps of the brain with soft tissue contrast. Conventional MRI technique modified to be used to image the functionality at high temporal resolution is known as fMRI. In fMRI the BOLD signal we measure is the hemodynamic response to neuronal and vascular changes at rest or in …
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Magnetically Actuated Microrobots for Tissue Elasticity Mapping in Colorectal Cancer Diagnosis
… drug delivery, minimally invasive surgery, and tissue characterization. This thesis investigates whether these microrobots can effectively measure colorectal tissue stiffness for early cancer diagnosis. The research combines mathematical modelling, computational simulations, and experimental …
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Backscatter And Attenuation Properties Of Mammalian Brain Tissues
… Ultrasound technology plays a major role in tissue characterization due to its low cost and portability that could be used to bridge a wide gap in the TBI diagnostic process. This research addresses the ultrasonic properties of mammalian brain tissues focusing on backscatter and attenuation. …
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Ultrasonic Characterization of Three Animal Mammary Tumors From Three-Dimensional Acoustic Tissue Models
… investigated how three-dimensional (3D) tissue models can be used to improve ultrasonic tissue characterization (UTC) techniques. Anatomic sites in tissue responsible for ultrasonic scattering are unknown, which limits the potential applications of ultrasound for tumor diagnosis. Accurate …
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Estimating the Medical Ultrasound in Vivo Power Spectrum
… the developed methods could be applied to other tissue characterization procedures as well as estimating the temperature increase in the tissue from ultrasound exposures.
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Improved Techniques for Statistical Analysis of the Envelope of Backscattered Ultrasound Using the Homodyned K Distribution
… backscatter can provide estimates describing tissue microstructure. Improving quantitative ultrasound techniques will result in improved diagnostic capabilities of ultrasound. Quantitative techniques were developed and assessed based on the envelope of backscattered ultrasound. The envelope of …
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Multi-parametric photoacoustic/ultrasound localization (PAUL) imaging and its applications
… and functional information for comprehensive tissue characterization. This thesis introduces a dual-modal photoacoustic and ultrasound localization (PAUL) imaging platform that integrates super-resolution ultrasound localization (UL) with photoacoustic (PA) imaging to enable multiparametric …
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Toward model-free and reference-free quantitative ultrasound
… clinically is the presence of layers over the tissue regions to be interrogated. Layer effects are not accounted for when using a reference phantom, reducing the technique's reliability. The dissertation presents experimental and computational approaches to improve the accuracy of QUS estimates …
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