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Understanding acceleration-induced displacement artifacts in phase-contrast MR velocity measurements

✍ Scribed by Richard Frayne; Brian K. Rutt

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
878 KB
Volume
5
Category
Article
ISSN
1053-1807

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✦ Synopsis

Abstract

A theoretical framework for understanding acceleration‐induced errors in phase‐contrast magnetic resonance velocity measurements has been developed. An important result of this framework is the interpretation of acceleration‐induced velocity errors as displacement artifacts due to the delay between velocity and spatial encoding. A rotating‐disk phantom was used to confirm the theoretically predicted displacement times (the difference between theory and experiment was 8.2%). Errors were also observed in velocity profiles measured in regions of fluid acceleration downstream from a step stenosis. The magnitude of these errors could be predicted and corrected by using the analytic framework.

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