Electromagnet arrangements for producing a magnetic field of hig

Details Electromagnet arrangements for producing a magnetic field of hig Electromagnet arrangements for producing a magnetic field of hig

1986-12-03

1987-12-01

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

335299, 324370, H01F 706

Patent

active

047107413

ABSTRACT:
A coil arrangement for producing a magnetic field of high homogeneity, such as is required in magnetic resonance imaging, comprising a single pair of identical annular coils (17A, 17B) disposed coaxially in spaced relationship and a pair of annular members (19A, 19B) of ferromagnetic material disposed coaxially with the coils, symmetrically with respect to the plane which perpendicularly intersects the axis of the coils centrally between them. The coils and ferromagnetic members have dimensions and are relatively positioned so that, with the coils carrying equal energizing currents, the more significant spherical harmonic coefficients are eliminated.

REFERENCES:
patent: 4584548 (1986-04-01), Inoue et al.
patent: 4658229 (1987-04-01), Chen et al.
patent: 4672346 (1987-06-01), Miyamoto et al.
Kaminishi K. et al., "Practical Method of Improving the Uniformity of Magnetic Fields Generated by Single and Double Helmholtz Coils", Review of Scientific Instruments, 52(3), pp. 447-453, Mar. 1981.
Romeo F. et al., "Magnetic Field Profiling: Analysis and Correcting Coil Design", Magnetic Resonance Imaging in Medicine, 1, 1984, pp. 44-65.

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