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 16 of 16 for “"Shear wave elastography"”.
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Shear Wave Elastography Based on Optical Coherence Tomography
… mechanical property, numerous research works in elastography have been conducted and had been successfully applied to countless clinical applications. Elastography techniques had been always rooted in medical imaging technique, classified into a range of scales, based on their imaging depth and …
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Ultrasound shear wave elastography imaging with external mechanical vibration
Ultrasound shear wave elastography (SWE) imaging is gaining wide acceptance in clinical practice as both a non-invasive and quantitative diagnostic modality. Most commercial SWE systems generate shear waves using acoustic radiation force (ARF), which requires complex hardware and is therefore only …
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Standardisation and quality assurance of 2D ultrasound Shear Wave Elastography imaging in breast tissue
… In 2009, a novel imaging modality called Shear Wave Elastography (SWE), an ultrasound technique visualising the elasticity of tissue, was introduced to the field of clinical breast imaging. Because malignant tissues are generally stiffer than benign tissues, SWE supports the …
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System identification and control of a miniature external mechanical vibration device towards clinical ultrasound shear wave elastography
… force (ARF) is commonly used to generate shear waves in ultrasound systems for shear wave elastography (SWE). However, ARF requires complex hardware that produces thermal stresses in tissues and electronic components. External mechanical vibration (EMV) is less power-exhaustive compared to …
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Models for Testing Contemporary Ultrasound Systems
… Five areas of particular recent interest are shear wave elastography, interventional ultrasound, microultrasound, and therapeutic ultrasound. These new developments motivate demand for new tissue models. The work discussed in this thesis presents different tissue models for these areas of …
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Pre-operative Risk Factors for Arteriovenous Fistula Failure in the Haemodialysis Population
… ultrasound markers of arterial elasticity (shear wave elastography) and strain (velocity vector imaging) were feasible methods of assessing arterial stiffness in the peripheral vasculature in a group of 40 volunteers and 47 patients. The methods were then assessed to determine if they could …
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May the force be with you : a medical ultrasound system with integrated force measurement
… can be measured. The device was used to perform shear wave elastography on tissue-mimicking phantoms and ex vivo tissue at varying force distributions. A gradient in applied pressure introduced a gradient in elasticity across the image for ex vivo tissue but not for phantoms. To consider how the …
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Effects of menopause and sex on shoulder complex tissue elasticity and pain-related outcomes
… (92 shoulders) underwent bilateral ultrasound shear wave elastography imaging to quantify elasticity in the upper trapezius (UT2, UT3), supraspinatus (SUP), lateral deltoid (LD), coracoacromial ligament (CAL), and coracohumeral ligament (CHL), alongside Pain Pressure Threshold (PPT) assessments …
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Design of Electromechanical Attachments for Improved Ultrasound Imaging Repeatability
… external mechanical vibration (EMV) for shear wave elastography (SWE), and volume ultrasound. Each of these technologies also has its limitations and some have not been optimized for clinical settings. In this work, these technologies are developed further into attachments to allow for …
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Ultrasonic imaging methods for quantitative musculoskeletal tissue assessment and improved prosthetic interface design
… evaluate the use of ultrasound indentation and shear wave elastography (SWE) to characterize tissue biomechanics: the former to investigate how SWE is affected by transducer force, and the latter presenting a novel approach for constitutive parameter identification using a combination of finite …
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Volumetric Acoustic Radiation Force Impulse Imaging Using Intracardiac Echocardiography
<p>Intracardiac echocardiography (ICE) based elastography methods have the potential to be useful for a number of clinical purposes including monitoring of ablation lesion formation and myocardial substrate characterization. However, 2-D field-of-view ICE catheters currently in use in the clinic …
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Effects of Mechanical Damage on Patellar Tendon Ultrasound Texture Parameters
… (in slack) periods in between. B-mode and Shear Wave Elastography (SWE) images were collected in a preloaded, unstrained state prior to each strain hold and following the final strain hold. Images were also collected at the peak stress, midpoint (t=15 minutes), and equilibrium stress state …
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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
… osteoarthritis. Additional experiments assessed shear-wave elastography (VTIQ/ARFI) for estimating cartilage elastic modulus and used hydrogel phantoms with known mechanical properties to determine the measurable range and limitations of elastographic stiffness estimation. Radiofrequency (RF) …