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Accuracy of segmented MR velocity mapping to measure small vessel pulsatile flow in a phantom simulating cardiac motion
Author(s) -
Arheden Håkan,
Saeed Maythem,
Törnqvist Erna,
Lund Gunnar,
Wendland Michael F,
Higgins Charles B,
Ståhlberg Freddy
Publication year - 2001
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.1100
Subject(s) - pulsatile flow , imaging phantom , offset (computer science) , physics , flow (mathematics) , flow velocity , plane (geometry) , optics , geometry , mathematics , computer science , mechanics , medicine , cardiology , programming language
The purpose of this study was to investigate the accuracy of conventional, segmented, and echo‐shared MR velocity mapping sequences to measure pulsatile flow in small moving vessels using a phantom with simulated cardiac motion. The phantom moved either cyclically in‐plane, through‐plane, in‐ and through‐plane, or was stationary. The mean error in average flow was –2% ± 3% (mean ± SD) for all sequences under all conditions, with or without background correction, as long as the region of interest (ROI) size was equal to the vessel cross‐sectional size. Overestimation of flow as a result of an oversized ROI was less than 20%, and independent of field of view (FOV) and matrix, as long as the offset in angle between the imaging plane and flow direction was less than 10 degrees. Segmented velocity mapping sequences are surprisingly accurate in measuring average flow and render flow profiles in small moving vessels despite the blurring in the images due to vessel motion. J. Magn. Reson. Imaging 2001;13:722–728. © 2001 Wiley‐Liss, Inc.