MRI mammography magnet

Details MRI mammography magnet MRI mammography magnet

1994-08-15

1995-03-28

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

335299, 1286535, 324319, G01R 3320, H01F 300, H01F 500

Patent

active

054020948

ABSTRACT:
A magnet is specially designed for the creation of an extremely uniform magnetic field in a small volume for use in MRI mammography. A disk of ferromagnetic material has a surface having a well adapted to receive the object to be examined and lined with a solenoidal coil which provides the basic magnetic field. Uniformity is increased by three additional coils surrounding the solenoidal coil and placed in annular slots surrounding the well. Of these three additional coils, the middle one generates a magnetic field in the well which opposes the basic magnetic field, and the others supplement the basic magnetic field. The ampereturns of the three additional coils are selected to maximize uniformity of the magnetic field in the well.

REFERENCES:
patent: 4701736 (1987-10-01), McDougall et al.
patent: 4721914 (1988-01-01), Fukushima et al.
patent: 4855703 (1989-08-01), Bessho et al.
patent: 4857874 (1989-08-01), Bessho et al.
patent: 4987398 (1991-01-01), Bessho
patent: 5117188 (1992-05-01), Ohkawa
patent: 5337001 (1994-08-01), McDougall et al.

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