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A velocity correlation method for measuring vascular compliance using MR imaging
Author(s) -
Urchuk Stephen N.,
Plewes Donald B.
Publication year - 1995
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.1880050603
Subject(s) - compliance (psychology) , imaging phantom , transducer , temporal resolution , ranging , sampling (signal processing) , biomedical engineering , materials science , acoustics , physics , optics , geology , medicine , geodesy , psychology , social psychology , detector
A method for estimating vascular compliance using MR velocity imaging is presented. The technique combines an analysis of pulse propagation, based on spatially averaged equations of continuity and momentum, together with phase‐contrast velocity measurements to estimate the compliance from a correlation of second‐order spatial and temporal velocity derivatives. The technique can be applied in the presence of reflected flow waves and uses velocity data acquired throughout the entire cardiac cycle. The accuracy of the technique was assessed in distensible vessel phantoms spanning a physiological range of compliance through a comparison with compliance estimates obtained using high‐resolution MR imaging and pressure transducers. The mean error of all measurements was found to be 0.04 ±0.02% per mm Hg, with the relative errors ranging from 1.2% to 46%. Error was found to decrease as the temporal sampling rate and/or image plane separation were increased. This suggests that an accurate hemodynamic evaluation of a vessel's elastic properties is feasible with MR velocity imaging techniques.