Quantification of intravoxel velocity standard deviation and turbulence intensity by generalizing phase-contrast MRI
نویسندگان
چکیده
منابع مشابه
Quantification of intravoxel velocity standard deviation and turbulence intensity by generalizing phase-contrast MRI.
Turbulent flow, characterized by velocity fluctuations, is a contributing factor to the pathogenesis of several cardiovascular diseases. A clinical noninvasive tool for assessing turbulence is lacking, however. It is well known that the occurrence of multiple spin velocities within a voxel during the influence of a magnetic gradient moment causes signal loss in phase-contrast magnetic resonance...
متن کاملQuantification of Turbulence Intensity by Generalizing Phase-Contrast MRI
P. Dyverfeldt, A. Sigfridsson, J-P. E. Kvitting, T. Ebbers Clinical Physiology, Linköping University, Linköping, Sweden, Biomedical Engineering, Linköping University, Linköping, Sweden, Center for Medical Image Science and Visualization (CMIV), Linköping University, Linköping, Sweden, Cardiothoracic Surgery, Linköping University Hospital, Linköping, Sweden Introduction Blood flow in the normal ...
متن کاملSimulation of Phase-Contrast MRI Intravoxel Velocity Standard Deviation (IVSD) Mapping
Introduction: Disturbed blood flow, characterized by velocity fluctuations, accompanies many cardiovascular diseases and may contribute to their progression [1]. Phase-contrast (PC) MRI intravoxel velocity standard deviation (IVSD, σ) mapping permits the quantification of the intensity of velocity fluctuations (turbulence intensity) [2]. This is achieved by exploiting how the presence of multip...
متن کاملQuantification of turbulence and velocity in stenotic flow using spiral three-dimensional phase-contrast MRI.
PURPOSE Evaluate spiral three-dimensional (3D) phase contrast MRI for the assessment of turbulence and velocity in stenotic flow. METHODS A-stack-of-spirals 3D phase contrast MRI sequence was evaluated in vitro against a conventional Cartesian sequence. Measurements were made in a flow phantom with a 75% stenosis. Both spiral and Cartesian imaging were performed using different scan orientati...
متن کاملPhase Contrast MRI Segmentation Using Velocity and Intensity
This paper presents a method for three-dimensional (3D) segmentation of blood vessels, i.e. determining the surface of the vessel wall, using a combination of velocity data and magnitude images obtained using phase contrast MRI. In addition to standard MRI images, phase contrast MRI gives velocity information for blood and tissue in the human body. The proposed method uses a variational formula...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2006
ISSN: 0740-3194,1522-2594
DOI: 10.1002/mrm.21022