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 156 for “"Ultrasound imaging"”.
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Innovations in three-dimensional ultrafast ultrasound imaging
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01
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Contrast-enhanced Doppler Ultrasound Imaging using Plane Waves
There is a clear advantage in having an imaging method that would be capable of displaying perfusion and vascular imaging simultaneously. In ultrasound, Doppler can visualize veins and arteries, but cannot detect the capillary level perfusion. Conversely, microbubble contrast-enhanced ultrasound …
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Null subtraction imaging technique for biomedical ultrasound imaging
In ultrasonic imaging, reduction of lateral sidelobes results in an improved image with less distortion and fewer artifacts. In general, apodization is used to lower sidelobes in exchange for increasing the width of the mainlobe and thus decreasing lateral resolution. Null subtraction imaging (NSI) …
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New Approaches to Aberration Correction in Medical Ultrasound Imaging
Our results imply that single-valued focusing operators may be able to correct for most of the aberration encountered in soft tissues; that increasing aperture should not be viewed merely as a source of aberration, but as an opportunity to more fully correct it; and that the noise penalty for using …
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Design of Electromechanical Attachments for Improved Ultrasound Imaging Repeatability
Ultrasound imaging (or ultrasonography) is a common tool used for medical diagnostics. It has many advantages over other imaging modalities (such as MRI and CT) such as being more portable, less expensive, and lower power. Ultrasound imaging is emerging as a noninvasive diagnostic alternative in …
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Deformation correction in ultrasound imaging in an elastography framework
Tissue deformation in ultrasound imaging is an inevitable phenomenon and poses challenges to the development of many techniques related to ultrasound image registration, including multimodal image fusion, freehand three-dimensional ultrasound, and quantitative measurement of tissue geometry. In …
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Qualitative Evaluation of Data Compression in Real-time Ultrasound Imaging
… project was to evaluate qualitatively real-time ultrasound imaging using objective and subjective techniques to determine the minimum bandwidth required for clinical diagnosis of various anatomical and pathological states. In the experimental setup live ultrasound video samples representing the …
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Three-dimensional free-hand ultrasound imaging system for medical applications
This thesis has developed a PC-based 3D free-hand ultrasound system using conventional ultrasound scanner. The 3D ultrasound system developed is used for carotid and brachial artery scanning to evaluate vessel wall characteristics, which have strong relationship to traditional atherosclerotic risk …
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Effects of nutrition and ultrasound imaging on the cardiovascular system
… on two major areas: the biological effects of ultrasound and ultrasound contrast agents, and nutritional interventions to inhibit the development of atherosclerosis. Ultrasound is a highly flexible and affordable imaging modality that has proven clinically useful in many diagnostic situations …
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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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Ultrasound imaging of cervical spine motion for extreme acceleration environments
… such as astronauts and military pilots. Ultrasound is known for dynamic imaging and diagnostic workup of the axial and appendicular skeleton, but is not currently used to image the cervical spine, the injury of which may change the biomechanics of the cervical vertebrae, which CT and MRI …
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Improving the Specificity of Medical Ultrasound Imaging Using Scattering Spectrum Matching
Medical ultrasound imaging systems continue to evolve at a fast pace enabled by advances in transducer technology, analog mixed-signal electronics, and high-performance computing. Ultrasound imaging is used in numerous applications, including echocardiography and peripheral vascular imaging in …
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Decreasing Error in Functional Hip Joint Center Calculation using Ultrasound Imaging
… rather than on actual bone. Here we introduce ultrasound imaging as an additional modality to measure the change in soft tissue thickness above bone while hip is flexed. We use this information on the tissue thickness change to recalculate position of markers placed on skin to match the …
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Improving ultrafast ultrasound imaging in both image quality and processing speed
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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Three-Dimensional Ultrasound Imaging For Blood Flow Assessment In First Carpometacarpal Osteoarthritis
… diagnosis, and treatment. Current clinical imaging modalities, x-ray and magnetic resonance imaging, are limited by their soft tissue contrast, and accessibility, respectively. There is a clinical need for point-of-care imaging tools to improve OA care. This thesis reports on an …
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Musculoskeletal ultrasound imaging - an exploration of physiotherapists' interests and use in practice
Background: Musculoskeletal ultrasound imaging, (MSKUSI) is an appealing modality for many professions and professionals. There are indications that physiotherapists have tried to access MSKUSI but the evidence base exploring their interests and clinical use is extremely limited. Aim: To explore …
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Deep structure ultrasound imaging using fundamental and third harmonic coded excitation techniques
… contrast-to-noise ratio (CNR) for an ultrasonic imaging system. The thickness mode of piezoelectric transducers produces a signal that is resonant at a fundamental frequency and odd harmonics. This behavior is exploited using coded excitation techniques to increase the usable bandwidth of the …
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Electromechanical systems to enhance the usability and diagnostic capabilities of ultrasound imaging
Ultrasound is used extensively in medicine to non-invasively examine soft tissues. Compared to computed-tomography (CT) scanning or X-ray imaging, ultrasound is lower-cost, more portable, real time, and subjects neither the caregiver nor the patient to potentially harmful ionizing radiation, which …
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