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

Clark, Chris A., Barker, Gareth J. and Tofts, Paul S. (2000) Improved reduction of motion artifacts in diffusion imaging using navigator echoes and velocity compensation. Journal of Magnetic Resonance, 142 (2). pp. 358-63. ISSN 1090-7807

Full text not available from this repository.

Abstract

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.

Item Type: Article
Keywords: Artifacts Brain/anatomy & histology Humans Magnetic Resonance Imaging/ methods Motion
Schools and Departments: Brighton and Sussex Medical School > Brighton and Sussex Medical School
Depositing User: Paul Stephen Tofts
Date Deposited: 28 Feb 2007
Last Modified: 30 Nov 2012 16:50
URI: http://sro.sussex.ac.uk/id/eprint/822
Google Scholar:14 Citations
📧 Request an update