Method for actively and passively shimming a magnet

Details Method for actively and passively shimming a magnet Method for actively and passively shimming a magnet

1996-08-07

1998-06-02

O'Shea, Sandra L.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

G01R 3320

Patent

active

057605858

ABSTRACT:
A method for actively and passively shimming a magnet having a magnetic field inhomogeneity, correction coils, and shim locations. The magnetic field is measured, and the inhomogeneity determined. The magnetic field created by a known current in each correction coil and by a known shim at each shim location is determined. Using linear programming, the optimum currents and shim sizes together are determined which minimizes the inhomogeneity plus the total currents used plus the total shim sizes used.

REFERENCES:
patent: 5006804 (1991-04-01), Dorri et al.
patent: 5045794 (1991-09-01), Dorri et al.

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