Electromagnet system for nuclear spin tomography

Details Electromagnet system for nuclear spin tomography Electromagnet system for nuclear spin tomography

1987-05-11

1988-02-02

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

324320, 335299, H01F 700

Patent

active

047231165

ABSTRACT:
An electromagnet system for nuclear spin tomography comprises a ferromagnetic yoke (41), two pole pieces (42, 43) arranged on the said yoke (41) with their pole faces (51, 52) facing each other, and at least one excitation coil (47, 48). The pole pieces (42, 43) delimit an air gap (44) having a diameter-to-width ratio of less than 2.5. There is arranged in the area of each of the pole faces (51, 52) formed by the pole pieces (42, 43) at least one substantially two-dimensional supplementary coil (55, 56, 57, 58) whose number of ampere turns is between 0.1% and 10% of the number of ampere turns of the excitation coil (47, 48). The excitation and supplementary coils generate together in the air gap (44) a magnetic field (B) which exhibits a homogeneity better than 10.sup.-4 in a spherical volume having a diameter equal to half the value of the width (H) of the air gap.

REFERENCES:
patent: 3513422 (1970-05-01), Watson et al.
patent: 3622869 (1971-11-01), Golay
patent: 4318043 (1980-02-01), Crooks et al.
patent: 4656449 (1987-04-01), Mallard et al.
patent: 4658229 (1987-04-01), Chen etal.
patent: 4672346 (1987-06-01), Miyamoto et al.
Review of Scientific Instruments, vol. 52, (12), Dec. 1981, pp. 1910-1912 (article by David H. West: "Computer-Assisted Magnet Shimming").

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