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Linear projection method for automatic slice shimming
Author(s) -
Shen Jun,
Rothman Douglas L.,
Hetherington Hoby P.,
Pan Jullie W.
Publication year - 1999
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/(sici)1522-2594(199912)42:6<1082::aid-mrm12>3.0.co;2-g
Subject(s) - projection (relational algebra) , computer science , artificial intelligence , algorithm
A fast, reliable automatic slice shimming method is described. In‐slice shim adjustments are based on one‐dimensional phase mapping of four in‐slice linear projections through the slice center. For axial, coronal, and sagittal slices it is shown that all in‐slice first‐, second‐, and third‐order spherical harmonic terms of B 0 inhomogeneity can be unequivocally determined and corrected. Through‐slice shim adjustment is achieved using a one‐dimensional projection of the entire slice or ROI along the slice‐selection direction. Applications of this method to single‐slice in vivo spectroscopic imaging of human brain have resulted in reproducible, high‐quality spectroscopic data. Magn Reson Med 42:1082–1088, 1999. © 1999 Wiley‐Liss, Inc.