Magnetic resonance methods and apparatus

Details Magnetic resonance methods and apparatus Magnetic resonance methods and apparatus

1996-07-02

1997-10-07

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01V 300

Patent

active

056752563

ABSTRACT:
A magnetic resonance imaging system includes a magnet system which includes pole pieces and an energizing coil. The end portions of the pole pieces are made from a material which, does not support eddy currents, such as insulated iron powder. An object to be imaged is placed in the gap between the pole pieces. A gradient coil system imposes desired gradient fields in the gap between the pole pieces. The gradient magnetic field sequences are controlled such that, for each gradient pulse or a particular polarity there is applied a compensating pulse of the same magnitude, but the opposite polarity. Each compensating gradient has an integral which is relatively small. Remanent magnetism in the end portions of the pole pieces is thereby substantially avoided.

REFERENCES:
patent: 4827235 (1989-05-01), Inomata et al.
patent: 5155436 (1992-10-01), Suzuki et al.
patent: 5304932 (1994-04-01), Carlson
patent: 5555251 (1996-09-01), Kinanen
patent: 5583439 (1996-12-01), Danby et al.

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