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Showing 1 to 20 of 202 for “"Shear wave"”.
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Shear Wave Splitting Analyses in West Texas
We have analyzed shear wave splitting data from local earthquakes in the Permian Basin in West Texas to understand crustal stress and induced seismicity. The selected events of ML2.0 are recorded by the TexNet and USArray/Transportable Array (TA) stations. SWS parameters, the fast polarization …
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Analysis of effect of using estimated shear wave data as compared to measured compressional and shear wave sonic log
… to wrong interpretation. One of such data is the shear wave velocity which in most cases is collected with the compressional wave velocity. The measured shear wave velocity log may contain errors that are due to drilling conditions, mud invasion etc. It may also contain cycle skips and might …
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Shear Wave Elastography Based on Optical Coherence Tomography
… Starting from the numerical model of mechanical waves, the behaviours of shear waves and surface waves in biological tissue is studied. Contact mechanical stimulations, as well as non-contact ultrasound and pulsed lasers are utilised to generate transient waves in biological samples. High speed …
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Shear wave ultrasound elastography of the shoulder joint tendons
A dissertation submitted to the Faculty of Health Sciences in full compliance for the requirement for the Master’s Degree in Technology: Radiography at Durban University of Technology, 2020.
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Complex shear modulus reconstruction using ultrasound shear-wave imaging
… soft tissue mechanical properties. Ultrasound shear-wave imaging can provide quantitative information about soft tissue mechanical properties, specifically the complex shear modulus. Advancing this field has the potential to bridge molecular, cellular, and tissue biology and to influence …
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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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Development of Deep Shear Wave Velocity Profiles and an Approach to Generate Site Signature Consistent Pseudo Shear Wave Velocity Profiles in the Mississippi Embayment
… details the development of a surface wave method (SWM) technique to generate deep shear wave velocity profiles (VS profiles), applying this technique at 24 sites across the Mississippi embayment and developing an approach to generate pseudo site signature consistent VS profiles from …
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LATERALLY HETEROGENEOUS SEISMIC ANISOTROPY INVESTIGATED BY SHEAR WAVE SPLITTING ANALYSES
… and upper mantle. In this study, we utilize the shear wave splitting technique to investigate the piercing-point-dependent azimuthal anisotropy beneath the northeastern edge of the Sichuan Basin in central China, and the spatial and temporal variations of anisotropy near the 2019 M7.1 Ridgecrest …
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Shear-wave imaging guidance for high-intensity focused ultrasound therapy
… in HIFU treatment.<br/><br/>HIFU-induced shear-wave (HiSW) imaging is proposed in this thesis as a new technique for tracking and monitoring the changes in the targeted area. The work includes HIFU transducer fabrication and characterization, in accordance with the FDA guidance. The …
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Acoustic Radiation Force Impulse-Driven Shear Wave Velocimetry in Cardiac Tissue
… to generated transverse-traveling mechanical waves in various biological tissues. The velocity of these waves is related to a medium's stiffness and thus can offer useful diagnostic information. Consequently, shear wave velocimetry has the potential to investigate cardiac disease states that …
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Ultrasonic Methods to Measure Shear Wave Velocity and Absorption for Tissue Viscoelasticity Characterization
… ultrasound methods, generating and tracing a shear wave (SW) propagating within the soft tissue was one of the promising approaches to measure the SW velocity and absorption, which were the key parameters to derive the tissue viscoelasticity. When the SW method was employed, several problems, …
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A new method to test shear wave splitting: improving statistical assessment of splitting parameters
Shear wave splitting has proved to be a very useful technique to probe for seismic anisotropy in the earth’s interior, and measurements of seismic anisotropy are perhaps the best way to constrain the strain history of the lithosphere and asthenosphere. However, existent methods of shear wave …
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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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Evolution of the oceanic lithosphere and shear wave travel time residuals from oceanic earthquakes
Thesis. 1976. M.S.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.
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Field investigation comparing conventional compressional-wave, converted-wave, and horizontally-polarized shear-wave reflections, A
Includes bibliographical references.
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Shallow 3D Shear Wave Velocity Model and Revised Site Period Prediction Map for the Mexico City Basin
… prediction map and to develop a shallow 3D shear wave velocity model of the Mexico City Basin. To accomplish this goal, an extensive literature review was performed to compile as much pertinent shear wave velocity and site period data for the region. In total, 75 sites were used to revise …
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Development of Deep Site Specific and Reference Shear Wave Velocity Profiles in the Canterbury Plains, New Zealand
<p>Deep (typically >1000 m) shear wave velocity profiles were developed across the Canterbury basin at nine strong motion stations using a combination of active and passive surface wave methods and horizontal to vertical spectral ratio measurements. A multi-mode, multi-method joint inversion …
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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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