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Improvements on an in Vivo automatic shimming method (FASTERMAP)

โœ Scribed by Jun Shen; Robert E. Rycyna; Douglas L. Rothman

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
539 KB
Volume
38
Category
Article
ISSN
0740-3194

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โœฆ Synopsis

Improvements on a localized, automatic shimming method described by Gruetter and Boesch (J. Magn. Reson. 96, 323-334 (1992)) and Gruetter (Magn. Reson. Med. 29, 804-811 (1993)) are presented. A spin-echo sequence employing a double sech refocusing scheme is used to acquire a field map along linear projections that improves the signal-to-noise ratio by at least a factor of two over the stimulated echo sequence previously used. To further improve the reliability of shim adjustments, a variance-weighted polynomial regression analysis is performed. This also extends the scope of application of this technique to global shimming. Localized 1H spectra of human brain shimmed by this method are presented.

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