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Improved reduction of motion artifacts in diffusion imaging using navigator echoes and velocity compensation

journal contribution
posted on 2023-06-07, 13:50 authored by Chris A. Clark, Gareth J. Barker, Paul S. Tofts
Navigator echoes provide a means with which to remove motion artifacts from diffusion-weighted images obtained using any multishot imaging technique. However, residual motion artifact is often present in the corrected images rendering the technique unreliable. It is shown that velocity-compensated diffusion sensitization when used in tandem with a navigator echo further reduces the degree of residual motion artifacts present in the corrected images and improves the reliability and clinical utility of the technique. This is demonstrated by applying a method for quantification of motion artifact to brain images of healthy volunteers scanned using both conventional (Stejskal-Tanner) and velocity-compensated gradient sensitization. Other factors affecting the efficacy of the navigator echo technique, such as brain pulsatile motion, gradient b factor, and navigator echo signal-to-noise ratio, are also discussed.

History

Publication status

  • Published

Journal

Journal of Magnetic Resonance

ISSN

1090-7807

Publisher

Elsevier

Issue

2

Volume

142

Page range

358-363

Department affiliated with

  • BSMS Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2007-02-28

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