MRI flow measurements with a flexible stenosis phantom
نویسندگان
چکیده
منابع مشابه
Assessment of Reproducibility of Geometric Distortion in MRI using Phantom Measurements
Introduction: Image distortion is one of the major problems of magnetic resonance imaging (MRI) for use in 3DMRI, velocity MRI, FMRI and radiotherapy treatment planning (RTTP). It is widely known that the most obvious effect of the inhomogenity of the magnetic fields and the nonlinearity of the gradient is the Geometric Distortion of MR tomograms. In this study, the...
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Purpose/Introduction: Fatality rates after rupture of intracranial aneurysms are high. The therapeutic decision is based on the result of rupture risk estimation and the risks related to treatment with 3-6% morbidity and 1.5% mortality rates for coiling [1]. Apart from the morphology and size of the aneurysm, hemodynamic information may contribute to rupture risk assessment. Flow information ca...
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Background 4D PCMR has the potential to help in understanding the direct relationship between fluid and structure interaction within the cardiovascular system, to allow for 3D visualization of blood flow patterns in the heart, and to make direct wall shear stress measurements. However, the wide dynamic range of velocities in the left ventricle (LV, range of 0-200 cm/s) can create difficulties w...
متن کاملAccuracy of flow measurement with phase contrast MRI in a stenotic phantom: where should flow be measured?
Methods Herein, a series of detailed experiments are reported for validation of MR measurements of steady and pulsatile flows with stereoscopic particle image velocimetry (SPIV) on three different stenotic models with 50%, 74%, and 87% area occlusions. Mean inlet Reynolds number was 190 for both steady and pulsatile cases, mimicking the flow of the human common iliac artery. Axial PC-MRI images...
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In this paper we examine the effect of mild stenosis on blood flow, in an irregular axisymmetric artery with oscillating pressure gradient. The Herschel-Bulkley fluid model has been utilized for this study. The combined influence of an asymmetric shape and surface irregularities of constriction has been explored in this computational study. An extensive quantitative analysis has been performed ...
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ژورنال
عنوان ژورنال: Current Directions in Biomedical Engineering
سال: 2019
ISSN: 2364-5504
DOI: 10.1515/cdbme-2019-0142