Electromagnetic device

Details Electromagnetic device Electromagnetic device

1996-11-26

1997-10-14

Spyrou, Cassandra C.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

324320, G01V 300, G01R 3320

Patent

active

056776608

ABSTRACT:
An electromagnetic device has a group of coils which are concentrically wound and used for generating a main magnetic field, and magnetic shims for correcting the uniformity of the main magnetic field in a uniform magnetic field region to be set in the vicinity of the central part of the group of coils. Part of the magnetic shims are arranged in a position where a particular high-order term in the uniform magnetic field becomes substantially zero when the correcting magnetic field generated by that part of the magnetic shims is expressed by a multinomial. The group of coils are arranged in such a manner that part of the high-order terms at the time the main magnetic field is expressed by the multinomial include a high-order magnetic term opposite in polarity to the high-order term of the correcting magnetic field whose order coincides with the order of that part of the high-order terms.

REFERENCES:
patent: 4983922 (1991-01-01), Tahara
patent: 5045794 (1991-09-01), Dorri et al.
patent: 5418462 (1995-05-01), Breneman et al.
"Magnet Field Profiling: Analysis and Correcting Coil Design," F. Romeo and D. I. Holt, Magnetic Resonance in Medicine 1, 44-45 (1984).

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