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In vitro validation of MR measurements of arterial pulse-wave velocity in the presence of reflected waves

✍ Scribed by Maja Stevanov; Joseph Baruthio; Daniel Gounot; Daniel Grucker

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
139 KB
Volume
14
Category
Article
ISSN
1053-1807

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✦ Synopsis

Abstract

A magnetic resonance imaging projective velocity encoding sequence was used to determine the pulse‐wave velocity in an artery model. To this end, a well‐defined flow phantom simulating flow propagation in large arteries was used. In order to validate the measurement method in the presence of large reflected waves, these were deliberately created in the phantom. The projective sequence was applied to two measurement sites and the wave velocity was determined from the spatial and temporal separations of the foot of the velocity waveform. A theoretical model describing reflection and attenuation phenomena was compared with experimental velocity waveforms. The model showed that reflections and attenuation can explain the important changes in velocity waveforms. The model also confirmed that in the presence of reflecting waves, the foot of the waveform can be used as a characteristic point for measurements through changes in the waveform. J. Magn. Reson. Imaging 2001;14:120–127. © 2001 Wiley‐Liss, Inc.

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