Correction circuit for a static magnetic field of an NMR apparat

Details Correction circuit for a static magnetic field of an NMR apparat Correction circuit for a static magnetic field of an NMR apparat

1984-04-25

1987-02-17

Smith, Jerry

Boots, shoes, and leggings

324309, 324310, G01N 2700, G01R 3308

Patent

active

046444734

ABSTRACT:
In the NMR apparatus the resonant conditions may be kept constant by adjusting the strength of the static magnetic field. The echo signal that is induced under the specific conditions is processed so as to obtain the deviation of the resonant frequency in the correction circuit. The shift of the given static magnetic field is calculated based upon the deviation of the resonant frequency. The DC energizing current for the H.sub.O power supply is varied based upon the magnetic field shift so as to maintain the NMR phenomenon at the desirable resonant conditions.

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Kumabe, A. Takiguchi et al.; "A Proton Resonance Magnetic Field Stabilizer Using a Frequency Stabilizer"; Nuclear Instruments and Methods, No. 3, Dec. 1973, pp. 387-393.
Ching Ming Lai et al.; "Automatic Correction of Nuclear Magnetic Resonance Zeugmatographic Projections"; J. Phys. E: Sci. Instrum., vol. 14, 1981, pp. 874-878.
Hutchison et al., "A Whole-Body NMR Imaging Machine," J. Phys, E: Sci. Instrum., vol. 12, 1980, pp. 947-955.
Power System for Electromagnet in an NMR Spectrometer, Vetrov et al. 8164, Instruments and Experimental Techniques, vol. 23, No. 3, Part 2, May-Jun. 1980, New York, USA, pp. 715-717.

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