Block for correcting magnetic-field homogeneity and a magnet fit

Details Block for correcting magnetic-field homogeneity and a magnet fit Block for correcting magnetic-field homogeneity and a magnet fit

1987-05-11

1989-05-30

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

335298, 324320, H01F 700

Patent

active

048355046

ABSTRACT:
A block of magnetized material for adjusting and correcting a magnetic field produced by a magnet provides adjustable correction by modifying the orientation of the magnetic moment of the block with respect to the field. A device which includes an intermediate member rotatably mounted in an orientable support and a fixing member rotatably mounted in the intermediate member makes it possible to orient a preferred direction of the block in a predetermined direction. This results in modification of magnetic disturbances produced by the block in the zone of interest of the magnet. Quantization of pointing of the orientable support is obtained by means of graduated index marks on the support, on the intermeidate member and on the fixing member.

REFERENCES:
patent: 4093912 (1978-06-01), Double et al.
patent: 4350955 (1982-09-01), Jackson et al.
patent: 4673882 (1987-06-01), Buford
patent: 4714908 (1987-12-01), Watabe et al.
Review of Scientific Instruments, vol. 56, No. 1, Jan. 1985, pp. 131-135, Woodbury, New York, U.S.; D. I. Hoult et al.,: "Shimming a Superconducting Nuclear-Magnetic-Resonance"*Chapter I and II*.
Patents Abstracts of Japan, vol. 9, No. 174 (P-374) [1897], 19 Jul. 1985; & JP-A-A-60 50 442 (Yokokawa Medical System K.K.) 20-03-1985 *Resume*.
Patents Abstracts of Japan, vol. 8, No. 163 (P-290) [1600], 27 Jul. 1984; & JP-A-59 60 346 (Toshiba K.K.) 06-04-1984 "Resume", PCT WO 84/00611, 16 Feb. 1984, W. Oldendorf, Adjustable Magnet Suitable for in Vivo NMR Imaging and Method of Adjusting the Same.

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