Method of site shimming on permanent magnets

Details Method of site shimming on permanent magnets Method of site shimming on permanent magnets

1989-08-11

1991-03-26

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

335306, H01F 702

Patent

active

050032763

ABSTRACT:
Ferromagnetic pieces are mounted on a plurality of nonmagnetic radial rods located at desired locations parallel to a pole face of a permanent magnet used in a magnetic resonance imaging apparatus. The pieces comprise plates which are translatable radially along each rod. Each rod carrying the plates are each rotatable about the rod axis to produce an error field cancelling environmentally induced, low order perturbations. A method for accomplishing same is also included. In a preferred embodiment, the plates are mounted on radial rods positioned at equal angles from one another, preferably thirty degrees (30.degree.) apart and arranged as spokes of a wheel.

REFERENCES:
patent: 2777099 (1957-01-01), Foss
patent: 3223897 (1965-12-01), Sullivan
patent: 4445102 (1984-04-01), Thorn et al.
patent: 4498048 (1985-02-01), Lee et al.
patent: 4672346 (1987-06-01), Miyamoto et al.
patent: 4673882 (1987-06-01), Buford

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