Actively shielded magnet for magnetic resonance apparatus

Details Actively shielded magnet for magnetic resonance apparatus Actively shielded magnet for magnetic resonance apparatus

1992-10-05

1993-09-14

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

335301, 324319, G01V 300, H01F 700, H01F 500, G01R 3340

Patent

active

052453065

ABSTRACT:
A magnet system for generating a uniform magnetic field in an examination zone (5) in an accommodation space of magnetic resonance apparatus is formed by a first, approximately cylindrical electromagnetic coil system (1) which encloses the examination zone and which is symmetrically arranged relative to a symmetry axis (9) and relative to a asymmetry plane (11) extending perpendicularly to the symmetry axis, and a second, approximately cylindrical electromagnetic coil system (7) which is arranged so as to be symmetrical relative to the symmetry axis and relative to the symmetry plane and which is arranged so as to be concentric with the first coil system, the magnetic dipole moments of the first and the second coil system being oppositely directed and substantially equal. The first coil system (1) includes a central coil (13) which is symmetrically arranged relative to the symmetry plane (11) and two pairs of further coils (15, 17) which are symmetrically arranged relative to the symmetry plane, the second coil system (7) including a central coil (21) symmetrically arranged relative to the symmetry plane and a pair of further coils (23) symmetrically arranged relative to the symmetry plane. As a result, despite the use of only eight coils the magnet system generates a highly uniform central magnetic field and only a very small stray field.

REFERENCES:
patent: 4890082 (1989-12-01), Fujita

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