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Neuroradiology. 2000 Feb;42(2):85-91.

Reducing motion artefacts in diffusion-weighted MRI of the brain: efficacy of navigator echo correction and pulse triggering.

Author information

1
Department of Neuroradiology, University of Heidelberg Medical School, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany. olaf.dietrich@urz.uni-heidelberg.de

Abstract

Diffusion-weighted MRI (DWI) is extremely sensitive to motion of the object being examined. Pulse triggering and navigator echo correction are methods for reducing motion artefacts which can be combined with conventional DWI sequences. Implementation of these methods in imaging sequences with a readout of one, three, or five echoes is presented and imaging results compared in a study of five healthy volunteers. As an objective measure for motion-induced image artefacts, the "artefacticity" of an image is defined. Pulse triggering and navigator echo correction significantly improve image quality and provide a technique for high-quality DWI on standard imagers without improved gradient hardware.

PMID:
10663480
DOI:
10.1007/s002340050020
[Indexed for MEDLINE]

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