G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 24/08 (2006.01) G01R 33/24 (2006.01) G01R 33/3875 (2006.01)
Patent
CA 2042148
15NM03501 ABSTRACT OF THE DISCLOSURE Determination of the shimming fields for a polarizing NMR magnet is performed by acquiring two NMR images with evolution times differing by ?. A pixel by pixel division of the images yields a third image whose phase is proportional to magnetic field inhomogeneity. Several such inhomogeneity images are acquired within a cylindrical volume and the data of the images is fit according to a set of polynomials approximating the fields of the magnet shim coils. The coefficient of this fitting procedure are used to set the current level in the corresponding shim coils. The interaction between correction fields is accommodated by an empirically derived correction matrix. This procedure may be repeated to provide more accurate shimming.
Glover Gary Harold
Schneider Erika
Company General Electric
Craig Wilson And Company
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