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.
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Showing 1 to 20 of 43 for “"Quantitative ultrasound"”.
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Quantitative ultrasound assessment of thermal therapy in liver
Quantitative ultrasound (QUS) is a promising technique for non-invasive tissue characterization. In this work, the potential of QUS to assess thermal therapy in liver tissue was examined. Specifically, the QUS parameters of attenuation slope, effective scatterer size (ESD), effective acoustic …
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Toward model-free and reference-free quantitative ultrasound
Current spectral-based quantitative ultrasound (QUS) techniques rely on a reference or a calibration signal to obtain system-independent ultrasonic scattering parameters. Adoption of QUS clinically has been hindered by (1) the need to limit clinical ultrasonic scanner settings to account for a …
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Quantitative Ultrasound Characterization and Monitoring of Locally Advanced Breast Cancer
… clinically significant. In this thesis, novel ultrasound backscatter signal analysis and machine learning techniques were developed to characterize breast tumours and detect early changes correlated to response. In the first study, tumour cell death was induced in human breast cancer …
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Remedies for challenges in deep learning-based quantitative ultrasound imaging
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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Development of Quantitative Ultrasound-Mediated Molecular Imaging of The Tumor Microenvironment
… penetration. To overcome these limitations, ultrasound (US)-mediated imaging techniques have been investigated to characterize these molecular imaging biomarkers.</p> <p>The objective of this work is to develop and validate US-mediated techniques to investigate the TME biomarkers of SO<sub>2 …
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Ultrasonic characterization of cell pellet biophantoms and tumors using quantitative ultrasound models
… between different tumor types shows that ultrasound backscattering is sensitive to unique tumor structures. The EHS tumor has a distribution of clustered cells and shows a different BSC and structure function pattern than the tumors that have a homogenous distribution of cells. A …
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Bone properties and skeletal maturity in adolescent males, as assessed by quantitative ultrasound
… skeletal maturity in children. Recently, quantitative ultrasound (QUS) technologies have been developed to examine bone properties and skeletal maturity in a safe, noninvasive and cost-effective manner. Objective: The purpose of this study was to compare bone properties and skeletal …
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Simulating acoustic wave reflection, transmission, and scattering in k-Wave for quantitative ultrasound applications
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2023-12-01
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QUiLT (Quantitative Ultrasound in Longitudinal Tissue Tracking): Stitching 2D images into 3D Volumes for Organ Health Monitoring
… 3D images of organs include MRI and CT. Ultrasound emerges as a viable alternative due to its low cost, portability, and ability for repeated use. This thesis presents a workflow for generating 3D images of the kidney and liver from 2D ultrasound images. We augment a 1D ultrasound probe …
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Using quantitative ultrasound for epidemiological research : associations with risk factors for low bone mineral density in South African premenopausal women
Quantitative Ultrasound (QUS) measurement at the calcaneum is a convenient, cost effective and noninvasive method of determining bone strength well suited to community-based research in countries with limited resources. Although only moderately correlated with dual X-ray absorptiometry (DEXA) …
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Improved Techniques for Statistical Analysis of the Envelope of Backscattered Ultrasound Using the Homodyned K Distribution
Biomedical ultrasound is a prominent imaging modality for diagnostics. Conventional ultrasonic imaging is qualitative in nature with spatial resolution up to hundreds of micrometers. Quantitative ultrasound techniques based on ultrasonic backscatter can provide estimates describing tissue …
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Three-dimensional impedance map analysis of biological tissue to elucidate small-scale acoustic scattering behavior
… a 3DZM can be analyzed to estimate model-based quantitative ultrasound parameters such as effective scatterer diameter (ESD) and effective acoustic concentration (EAC). The goal in this approach is to determine a link between the quantitative ultrasound estimates made from tissue and actual …
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Effect size estimation and robust classification for irregularly sampled functional data
… of functional data from inter-laboratory quantitative ultrasound measurements, and in a reanalysis of Canadian weather data. Moreover, we represent the asymptotic power of functional ANOVA test as a function of proposed measure. The agreement between the asymptotic and empirical results is …
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Non-contact quantitative imaging of limbs, bone and tissue, using ultrasound tomographic techniques
Non-contact and quantitative ultrasound images of bone and soft tissue are produced from original algorithms applied to observational data sets collected on two custom built ultrasound imaging systems for limb imaging. The images are quantitative in that the distribution of sound speeds and …
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The Mechanism of Action of Hyaluronan Therapy as a Treatment for Osteoarthritis and the Assessment of Osteoarthritic Articular Cartilage Using Ultrasound
… the molecular and tissue level, and (2) whether quantitative ultrasound imaging can detect early degenerative changes in articular cartilage before irreversible osteoarthritic damage develops. By combining molecular characterisation, ex vivo cartilage experiments, and advanced ultrasound imaging, …
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A FPGA/DSP based ultrasound system for tumor detection
… of detection of size and location of tumor using ultrasound transmission. The system utilizes Quantitative Ultrasound (QUS) which means sending an ultrasound signal from a transmitter and receiving it at multiple receivers. This received signal is analyzed for echogenic as well as echolucent …
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Quantitative ultrasonic characterization of diffuse scatterers in the presence of structures that produce coherent echoes
Quantitative ultrasound (QUS) techniques that parameterize the backscattered signal power spectrum have demonstrated significant promise for ultrasonic tissue characterization. Some QUS parameters, including the effective scatterer diameter (ESD) and the effective acoustic concentration (EAC) that …
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Evaluation of the accuracy and precision of ultrasound attenuation slope estimates
New approaches in the field of ultrasound utilize the frequency content of the backscattered signal, which contains information about the scattering tissue structure and enables quantitative ultrasound imaging. The ultrasonic attenuation is a quantitative parameter that can be used to characterize …
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Bone Mineral Density In Hiv: A Comparison Of Hiv Positive Versus Negative Patient With Lower Limb Long Bone Fractures
… BMD measurement performed using a calcaneal quantitative ultrasound scan (cQUS) and excluded those individuals who had never had a cQUS performed. Results: Of 400 individuals recruited from the parent study, 172 (43%) had their BMD measured. 27(15.7%) were HIV-positive. Overall, the BMD and …
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