Automatic, localized in vivo adjustment of all first- and second-order shim coils.

Détails

ID Serval
serval:BIB_E390593489C1
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Automatic, localized in vivo adjustment of all first- and second-order shim coils.
Périodique
Magnetic Resonance in Medicine
Auteur⸱e⸱s
Gruetter R.
ISSN
0740-3194 (Print)
ISSN-L
0740-3194
Statut éditorial
Publié
Date de publication
1993
Volume
29
Numéro
6
Pages
804-811
Langue
anglais
Notes
Publication types: Journal ArticlePublication Status: ppublish
Résumé
The implementation of a "fast, automatic shimming technique by mapping along projections" (FASTMAP) on a 2.1-Tesla whole-body system is described. The method provides a localized adjustment of all first- (X, Y, Z) and second-order (Z2, ZX, ZY, X2-Y2, 2XY) coils in 2 min. The time savings are achieved by mapping the magnetic field along six projections rather than from whole-imaging data sets. An analysis of noise error propagation suggests that in 64-ml volumes the residual linewidths obtained with the method are negligible when the signal-to-rms-noise ratio is above 30. The initial application of the method to localized 13C, 31P, and 1H spectroscopy of the human brain resulted in linewidths of approximately 2 Hz for 13C (144-ml volume), approximately 2.5 Hz for 31P (36-ml volume) and approximately 4 Hz for 1H (36-ml volume) with symmetric and reproducible lineshapes.
Mots-clé
Brain/anatomy & histology, Humans, Image Processing, Computer-Assisted, Magnetic Resonance Spectroscopy/instrumentation, Magnetic Resonance Spectroscopy/methods, Time Factors
Pubmed
Web of science
Création de la notice
04/08/2010 15:28
Dernière modification de la notice
20/08/2019 16:07
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