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A gradient scheme suitable for localized shimming and in vivo 1 H/ 31 P STEAM and ISIS NMR spectroscopy
Author(s) -
Yongbi Ngong M.,
Payne Geoffrey S.,
Leach Martin O.
Publication year - 1994
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.1910320612
Subject(s) - shim (computing) , nuclear magnetic resonance , chemistry , in vivo , line (geometry) , eddy current , nuclear magnetic resonance spectroscopy , analytical chemistry (journal) , algorithm , physics , materials science , computer science , mathematics , chromatography , geometry , medicine , quantum mechanics , erectile dysfunction , microbiology and biotechnology , biology
A gradient scheme is presented which may be used for STEAM or ISIS localization. One application of the scheme is to perform single‐shot STEAM shimming prior to data acquisition with STEAM and ISIS, using identical gradient amplitudes and durations. Using conventional STEAM to shim for ISIS can produce line‐shape distortions induced by different eddy currents in the two sequences; with this gradient scheme the problem is minimized. Line‐shape improvements of STEAM and ISIS localized data obtained after volume localized shimming with the proposed STEAM sequence are demonstrated. The localization performance of the STEAM and ISIS sequences are demonstrated on phantoms and in vivo for 1 H and 31 P metabolites.