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Fast, simple gradient delay estimation for spiral MRI

✍ Scribed by Ryan K. Robison; Ajit Devaraj; James G. Pipe

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
694 KB
Volume
63
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

Timing delays between data acquisition and gradient transmission result in image degradation. This is especially true in spiral MRI, where delays can alter data in a nonuniform manner, generating significant artifact in the reconstructed data. The many methods that exist to mitigate these delays or measure the k‐space coordinates require long measurement times, complicated analysis, specialized phantoms or hardware, or significant changes to the sequence of interest. A fast and simple method is proposed to measure delays on each gradient channel. It requires only minimal modification to an existing spiral sequence and can be used to measure independent delays on three gradient channels and any scan subject within six sequence repetition times. The effectiveness and accuracy of this method are analyzed. Magn Reson Med 63:1683–1690, 2010. Β© 2010 Wiley‐Liss, Inc.

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