Apparatus and method for magnetic resonance imaging using pre-po

Details Apparatus and method for magnetic resonance imaging using pre-po Apparatus and method for magnetic resonance imaging using pre-po

1994-12-22

1996-07-16

O'Shea, Sandra L.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

335299, G01R 3320

Patent

active

055370403

ABSTRACT:
In an apparatus and method for magnetic resonance imaging, an imaging field (B.sub.p) and a pre-polarization field (B.sub.p) are generated by means of electromagnetic coils ALC in an air gap between pole pieces of a magnet core. The pole pieces are designed such that, as the current in the coils is increased, the field strength increases only in the central area between pole pieces up to the strength (B.sub.p) of the pre-polarization field. This is due to the saturation of the edge zones of pole pieces that restricts the increase of field strength in the edge zones of the air gap.

REFERENCES:
patent: 4723116 (1988-02-01), Muller et al.
patent: 4766378 (1988-08-01), Danby et al.
patent: 4998976 (1991-03-01), Rapoport
patent: 5063934 (1991-11-01), Rapoport et al.

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