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Showing 1 to 20 of 39 for “"Radiation force"”.
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Radiation force modeling for ICESat precision orbit determination
… the TOPEX/Poseidon satellite, to compute solar radiation forces. This “macro-model” has been adapted to the ICESat geometry, and additionally, extended to the calculation of forces induced by radiation reflected and emitted from the Earth. To determine the area and reflectivity parameters of the …
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Acoustic Radiation Force Impulse Imaging of Myocardial Performance
… performance is myocardial stiffness. Acoustic radiation force impulse (ARFI) imaging has been demonstrated to be capable of visualizing variations in local stiffness within soft tissue. </p><p>In this thesis, the initial investigations into the visualization of myocardial performance with ARFI …
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Radiation Force Measurements at a Water-Air Interface
Made available in DSpace on 2017-07-06T18:56:06Z (GMT). No. of bitstreams: 3 Sakai_Stacie_S_MS.pdf: 76086248 bytes, checksum: e0540c45c692350e3d23e8108c733cdb (MD5) Sakai_Stacie_S_MS_ABS.pdf: 989645 bytes, checksum: 17d42bef12b4a513913b2f4f40ea7f6e (MD5) license.txt: 4813 bytes, checksum: …
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Volumetric Acoustic Radiation Force Impulse Imaging Using Intracardiac Echocardiography
… array transducers to perform ICE-based acoustic radiation force impulse (ARFI) imaging on multiple elevation planes at once, improving on current methods in terms of speed and ease-of-use.</p><p>The Siemens Acuson SC2000 ultrasound scanner was programmed with sequences to perform SWEI imaging on …
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Identifying Vulnerable Plaques with Acoustic Radiation Force Impulse Imaging
… evaluates the hypothesis that Acoustic Radiation Force Impulse (ARFI) imaging can noninvasively identify lipid regions, that have been shown to increase a plaque's propensity to rupture, within carotid artery plaques <italic>in vivo</italic>. The work detailed herein describes …
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Mapping Myocardial Elasticity with Intracardiac Acoustic Radiation Force Impulse Methods
… echocardiography transducer, acoustic radiation force methods may provide a useful means of characterizing the heart's elastic properties. Elasticity imaging may be of benefit for diagnosis and characterization of infarction and heart failure, as well as for guidance of ablation therapy …
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Acoustic Radiation Force Impulse-Driven Shear Wave Velocimetry in Cardiac Tissue
<p>Acoustic radiation force impulses (ARFI) have been used 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 …
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Assessment of Mechanical and Hemodynamic Vascular Properties using Radiation-Force Driven Methods
… atherosclerotic disease by using acoustic radiation</p><p>force (ARF) elasticity methods to estimate the mechanical and material</p><p>properties of plaque. However, recent evidence suggests that cardiovascular disease</p><p>(CVD), in addition to involving pathological changes in arterial …
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Acoustic Radiation Force on a Fluid to Fluid Boundary by Phase Plate Focused Ultrasound
… the physics and applications of the ultrasonic radiation force at the interface between two immiscible fluids were investigated. These studies were performed using low-profile discrete-stepped lenses to the modify the phase of the incident radiation generating multiple field morphologies. In its …
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Assessment of Cardiac Function by Acoustic Radiation Force (ARF) Based Methods of Ultrasound Elastography
… measurement of cardiac function. </p><p>Acoustic radiation force (ARF) based ultrasound elastography techniques were developed in early 2000s and have been used to measure the static stiffness of tissue. These techniques are being used in the clinic for diagnosis of disorders and malignancies in …
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Formation Process of Acoustophoretic Patterns
The acoustic radiation force is a nonlinear wave effect that exerts a non-zero time- averaged force on objects in the wave. In recent years, the acoustic radiation force has been widely explored for manipulating objects and small particles. These applications range from moving a few objects at a …
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Particle separation via the hybrid application of optical and acoustic forces
… method of manipulating particles with the forces exerted by a laser beam, while acoustic trapping is a scalable technique capable of exerting a force on particles through standing wave resonance. These complimentary modalities can be utilised in a hybrid system to give a resultant technique …
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Experimental and numerical investigation of steady-state and transient ultrasound directed self-assembly of spherical particles in a viscous medium
… self-assembly (DSA) utilizes the acoustic radiation force associated with a standing ultrasound wave field to organize particles dispersed in a fluid medium into specific patterns. The ability to tailor the organization and packing density of spherical particles using ultrasound DSA in a …
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Super-Resolution Force Spectroscopy for Revealing Sub-nucleotide Motion in Ribosomal Frameshifting and DNA Methylation
… focuses on applying super-resolution force spectroscopy (SURFS) as a unique tool to resolve frameshifting products and intermediate states, with unprecedented resolution. Two different forms of forces have been studied, centrifugal force and acoustic radiation force. Using centrifugal …
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System identification and control of a miniature external mechanical vibration device towards clinical ultrasound shear wave elastography
An acoustic radiation 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 …
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Design and evaluation of a 2-D planar therapeutic ultrasound phased array
… was measured for the unfocused array using radiation force measurements.
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Corpo de prova termocromático para verificar área de radiação eficaz em ultrassom fisioterapêutico
… curve must be known, and, thus, the effective radiation area (ERA) and output power need to be known. The ERA determination according to Norm is a specialized procedure not easily available, thus while the power output of transducers require radiation force balances. Test-objects made with …
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Ultrasound shear wave elastography imaging with external mechanical vibration
… SWE systems generate shear waves using acoustic radiation force (ARF), which requires complex hardware and is therefore only available on high-end and premium systems. External mechanical vibration (EMV) is an alternative to induce shear waves without expensive electronics, which potentially …
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