MRI magnets

Details MRI magnets MRI magnets

1994-01-04

1995-03-28

Pfaffle, Krista M.

Surgery

Truss

Pad

1286535, 324318, 324319, 324320, 335296, 335302, 335299, A61B 5055, G01R 3338

Patent

active

054007860

ABSTRACT:
An MRI magnet arrangement comprises, an annular electromagnet defined by a coil, an annular shim of magnetic material coaxially disposed within the coil, first permanent magnet means having a field, the direction of which is the same as the field of the coil, disposed coaxially within the said shim and second permanent magnet means disposed coaxially within the said first permanent magnet means, the field of which is arranged to be opposite in direction to the field produced by the said first permanent magnet means, the arrangement being such that the magnetic field produced in an imaging volume within the said second permanent magnet means is substantially homogeneous.

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patent: 4931760 (1990-06-01), Yamaguchi et al.
patent: 4983922 (1991-01-01), Tahara
patent: 5061897 (1991-10-01), Danby et al.
patent: 5154603 (1992-10-01), Sepponen
patent: 5296811 (1994-03-01), Ehnholm et al.

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