title: Linear projection method for automatic slice shimming.
abstract: 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.
authors.affiliation: The Nathan S. Kline Institute for Psychiatric Research, Orangeburg, NY 10962, USA.
authors.forename: J
authors.initials: J
authors.lastname: Shen
authors.forename: D L
authors.initials: DL
authors.lastname: Rothman
authors.forename: H P
authors.initials: HP
authors.lastname: Hetherington
authors.forename: J W
authors.initials: JW
authors.lastname: Pan
mesh_terms: D001921:Brain / Q000033:anatomy & histology; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D019047:Phantoms, Imaging