Magnet shimming using information derived from chemical shift im

Details Magnet shimming using information derived from chemical shift im Magnet shimming using information derived from chemical shift im

1987-02-27

1988-04-26

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01R 3320

Patent

active

047407530

ABSTRACT:
A method for shimming a magnet in a nuclear magnetic resonance (NMR) system employs measurements of the magnetic field obtained from chemical shift imaging (CSI) of a homogeneous phantom. The data are acquired, in one embodiment, in four planes parallel to, and rotated about, the axis of the magnet. A special volume subset of data are expanded in an orthonormal basis set (associated Legendre polynomials in one embodiment) for N+1 separate experiments, where N is the number of shim coils to be adjusted. The result is an N.times.N matrix of calibration coefficients for the shim coil set and a vector of shim current changes which must be applied to null out the measured field inhomogeneity.

REFERENCES:
patent: 4585992 (1986-04-01), Maudsley et al.
patent: 4623844 (1986-11-01), Macovski
patent: 4652826 (1987-03-01), Yamamoto et al.
patent: 4661775 (1987-04-01), Kormos et al.

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