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On the nature and reduction of the displacement artifact in flow images

✍ Scribed by Dwight G. Nishimura; John I. Jackson; John M. Pauly

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
653 KB
Volume
22
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

In flow‐imaging experiments with 2‐D Fourier transform sequences, the time difference between phase encoding and readout leads to a potentially misleading displacement artifact. This artifact arises in regions of rapid flow and high shear, and manifests as an intensity distortiion in additton to a bulk shift. We have studied methods of mitigating the artifact, including offset‐echo acquisition, backward‐evolving phase encoding, moment‐compensated phase encoding, and projection‐reconstruction imaging. Experiments on flow phantoms verified the nature and reduction of this displacement artifact. Of the four methods studied, the projection‐reconstruction sequence proved to be the most effective, completely eliminating the artifact. © 1991 Academic Press, Inc.

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