Method for setting the current through shim coils and gradient c

Details Method for setting the current through shim coils and gradient c Method for setting the current through shim coils and gradient c

1993-04-19

1994-09-06

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324319, G01V 300

Patent

active

053451783

ABSTRACT:
For calculating the magnetic field inhomogeneity, a gradient echo sequence or a spin echo sequence having a non-central 180.degree. radio-frequency pulse is first carried out. The nuclear magnetic resonance signal thus acquired is Fourier-transformed and the phase curve of the nuclear spins in a given region is identified. This is multiply repeated in different projections. The phase curves that are obtained are analyzed with a fit method and the coefficients of the spherical, harmonic functions describing the field distribution are identified therefrom. The current to be supplied to the individual shim coils and an offset current for the gradient coils can thus be calculated.

REFERENCES:
patent: 4672318 (1987-06-01), Sekihara et al.
patent: 4680551 (1987-07-01), O'Donnell et al.
patent: 4987371 (1991-01-01), Glover et al.
patent: 5168232 (1992-12-01), Glover et al.
"Aspects of Shimming a Superconductive Whole-Body MRI-Magnet," Frese et al., Proc. 9th Int. Conf. on Mag. Tech., Zurich, Sep. 9-13, 1985, pp. 249-251.
"Fast, Non-iterative Shimming of Spatially Localized Signals. In Vivo Analysis of the Magnetic Field along Axes," Gruetter, J. Mag. Res. vol. 96 (1992), pp. 323-334 (no month).
"The Ancient and Honourable Art of Shimming," Chmurny et al., Concepts in Magnetic Resonance, vol. 2 (1990) pp. 131-149 (no month).

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