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Showing 1 to 18 of 18 for “"ARFI"”.
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Acoustic Radiation Force Impulse Imaging of Myocardial Performance
… 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 imaging are presented. …
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Identifying Vulnerable Plaques with Acoustic Radiation Force Impulse Imaging
… 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 development efforts and results …
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Mapping Myocardial Elasticity with Intracardiac Acoustic Radiation Force Impulse Methods
… intracardiac acoustic radiation force impulse (ARFI) imaging and shear wave elasticity imaging (SWEI) are viable tools for quantification of myocardial elasticity, both temporally and spatially. Multiple track location SWEI (MTL-SWEI) is used to show that, in healthy in vivo porcine ventricles, …
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A 3-D Multiparametric Ultrasound Elasticity Imaging System for Targeted Prostate Biopsy Guidance
… including acoustic radiation force impulse (ARFI) imaging and shear wave elasticity imaging (SWEI), to develop and optimize a robust 3-D elasticity imaging system for ultrasound-guided prostate biopsies and to quantify its performance in prostate cancer detection. Towards that goal, in this …
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Assessment of Mechanical and Hemodynamic Vascular Properties using Radiation-Force Driven Methods
… integrating B-mode, color-flow Doppler, and ARFI imaging were developed</p><p>(BACD imaging), validated in tissue-mimicking phantoms, and demonstrated for in</p><p>vivo imaging. The resulting system allows for the real-time acquisition (< 20 Hz) of</p><p>spatially registered B-mode, …
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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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Volumetric Acoustic Radiation Force Impulse Imaging Using Intracardiac Echocardiography
… 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 the Soundstar 8F linear …
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Assessment of Cardiac Function by Acoustic Radiation Force (ARF) Based Methods of Ultrasound Elastography
… both acoustic radiation force impulse (ARFI) and shear wave elasticity imaging (SWEI) ultrasound elastography techniques were studied. These are qualitative and quantitative measures of stiffness, respectively. While the focus of the studies was more on SWEI due to its quantitative …
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Menningararfur Eyrarbakka : hver er menningararfur Eyrarbakka, hvernig er best að varðveita hann og hvers virði er hann fyrir íbúana og samfélagið?
… beint að helstu hugtökum sem tengjast menningararfinum og skilgreiningar á menningu, arfi og menningararfi voru rannsakaðar, ásamt hugtökunum um virði, virðismat og virðisgreiningu. Einnig verður rýnt í hvernig menningararfurinn er túlkaður og mikilvægi þess að varðveita hann. Til að túlka …
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Transport properties of anisotropic superconductors
In some heavy-fermion compounds (UPt3, and UBe13 under pressure) the normal state transport properties at low temperatures behave qualitatively as one would expect if electron-impurity interactions were the dominant source of scattering. The experimental data on ultrasonic attenuation and thermal …
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A dynamic two-level theory of state implosion: The cases of Lebanon, Algeria, and Yugoslavia
Why do state implosions occur? This question urges itself on theorists and practitioners in international relations and security in the aftermath of the dissolution of the Soviet Union. Despite the importance of the question, contemporary security and international relations theory has devoted …
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Ákvörðun erfðafjárskatts
… grein fyrir erfðafjárskatti af fyrirframgreiddum arfi og skattlagningu gjafa. Rakið er hvaða reglur gilda um erfðafjárskatt í framkvæmd og um þær kæruheimildir til yfirskattanefndar sem kveðið er á um í erfðafjárskattslögum. Fjallað verður um þær afleiðingar er geta átt sér stað ef brotið er gegn …
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The Potential for Ultrasonic Image-Guided Therapy Using a Diagnostic System
… image contrast, face heating, hydrophone, and ARFI displacement measurements. From these results, we conclude that the most promising design is a passively and actively cooled, PZT-4 multilayer composite transducer, while the acoustically lossless lens and capactive micro-machined transducers …
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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
… 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) time-varying strain imaging was …