Field mapping without reference scan using asymmetric echo-planar techniques.

Details

Serval ID
serval:BIB_39046B3DB0A3
Type
Article: article from journal or magazin.
Collection
Publications
Title
Field mapping without reference scan using asymmetric echo-planar techniques.
Journal
Magnetic Resonance in Medicine
Author(s)
Gruetter R., Tkác I.
ISSN
0740-3194 (Print)
ISSN-L
0740-3194
Publication state
Published
Issued date
2000
Volume
43
Number
2
Pages
319-323
Language
english
Notes
Publication types: Comparative Study ; Journal Article ; Research Support, U.S. Gov't, P.H.S.Publication Status: ppublish
Abstract
Improvements in Bo mapping and shimming were achieved by measuring the static field information in multiple subsequent echoes generated by an asymmetric echo-planar readout gradient train. With careful compensation, eddy current effects were shown to affect the adjustment of the shim coils minimally. In addition to reducing the time required for field mapping by two-fold, the sensitivity was simultaneously optimized irrespective of the prevalent T2* present, thereby minimizing the error of the static field measurement to below 0.1 Hz. With adiabatic low flip-angle excitation, the time required for field mapping was below 1 second.
Keywords
Echo-Planar Imaging/instrumentation, Echo-Planar Imaging/methods, Fourier Analysis, Humans, Phantoms, Imaging/statistics & numerical data, Software, Time Factors
Pubmed
Web of science
Create date
04/08/2010 15:28
Last modification date
20/08/2019 13:28
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