NMR tomography apparatus having iron-free dc motors for capacito

Details NMR tomography apparatus having iron-free dc motors for capacito NMR tomography apparatus having iron-free dc motors for capacito

1984-08-17

1990-02-20

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

G01R 3320

Patent

active

049029754

ABSTRACT:
A nuclear magnetic resonance tomography apparatus has a coil for generating a basic magnetic field, a gradient coil and measuring coils. A capacitor arrangement precisely adjusts the resonance of the measurement coil to the basic field coil. An iron-free dc motor is disposed within the field generated by the basic field coil for physically adjusting the plates of the capacitors connected in the circuit including the measurement coil. The rotor and coils of the iron-free dc motor are disposed within the basic magnetic field such that the basic magnetic field functions as the stator field for operating the motor.

REFERENCES:
patent: 2413391 (1946-12-01), Usselman
patent: 4035697 (1977-07-01), Arnold, Jr.
patent: 4052661 (1977-10-01), Higham et al.
patent: 4129822 (1978-12-01), Traficante

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