NMR image forming apparatus

Details NMR image forming apparatus NMR image forming apparatus

1985-05-28

1987-05-05

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324318, G01R 3320

Patent

active

046635920

ABSTRACT:
The static magnetic fields of an NMR imaging apparatus should be maintained constant in intensity in order to obtain satisfactory NMR images. Coils used to generate the static magnetic fields, and the supporting frames therefor, are subject to heat expansion due to changes in the temperature, which causes fluctuations in the intensity of the generated static magnetic fields. In the invention, the temperatures of the coils, frames, atmosphere and cooling water, and the amount of cooling water, are detected, and the energizing current for the static magnetic field coils is selectively controlled, based on the detected quantities, to thereby maintain constant the intensity of the generated static magnetic fields.

REFERENCES:
patent: 3525928 (1970-08-01), Nagao et al.
patent: 3921060 (1975-11-01), Ekimovoskikhe et al.
patent: 4587492 (1986-05-01), Laudermilch
B. K. Ratnikov, Powerful-Field Solenoid with Water Cooling, Instrum. & Exp. Tech., vol. 14, No. 5, Sep.-Oct. 1971.

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