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Effects of intravoxel velocity distributions on the complex difference method of phase‐contrast MR angiography
Author(s) -
Hamilton Craig A.
Publication year - 1996
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.1880060223
Subject(s) - voxel , contrast (vision) , phase contrast microscopy , imaging phantom , angiography , distribution (mathematics) , nuclear magnetic resonance , physics , mathematics , nuclear medicine , radiology , medicine , mathematical analysis , optics
Abstract The complex difference method of phase‐contrast MR angiography is affected not only by the degree of velocity encoding applied during the scan but also by the variance of the intravoxel velocity distribution. The reconstructed intensities of voxels with the same average flow rate but different variances of the velocity distribution can differ significantly. Mathematical analysis and scanner phantom experiments confirm this conclusion.