Magnet assembly in MRI instrument

Details Magnet assembly in MRI instrument Magnet assembly in MRI instrument

1996-08-30

1998-06-30

Luebke, Renee S.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

324320, G01V 300

Patent

active

057740348

ABSTRACT:
Proposed is an improvement in a magnet assembly of an MRI instrument of the permanent magnet type comprising a pair of permanent magnets facing each other and forming a magnet gap therebetween. A pair of pole pieces each of which are mounted on one of the permanent magnets and a pair of gradient-field coils each of which are mounted on one of the pole pieces where both the pole pieces and coils face the gap. With an object of the invention to cancel the adverse influences caused by the residual magnetization of the pole pieces by the gradient magnetic field generated in the gradient-field coils. The invention proposes providing a pair of magnetic-field compensation members each on one of the gradient-field coils so that the residual magnetization in the compensation members generates a magnetic field which is compensatory for the magnetic field due to the residual magnetization in the pole pieces.

REFERENCES:
patent: 4631481 (1986-12-01), Young et al.
patent: 4943774 (1990-07-01), Breneman
patent: 5061897 (1991-10-01), Danby et al.
patent: 5363078 (1994-11-01), Ries et al.
patent: 5495171 (1996-02-01), Danby et al.
patent: 5555251 (1996-09-01), Kinanen

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