Method and apparatus for tuning an NMR field coil

Details Method and apparatus for tuning an NMR field coil Method and apparatus for tuning an NMR field coil

1990-04-30

1992-01-14

Williams, Hezron E.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01R 3320

Patent

active

050814184

ABSTRACT:
A method of tuning a radio frequency coil for use in MR imaging applications uses reactive shunts having a reactance in parallel with a switch to connect sections of the coil to ground thereby constraining the resonant mode of the coil to a known orientation. A plurality of measurements of the frequency of the resonances along different such constrained orientations is used to deduce the frequencies of the two unconstrained orthogonal resonant modes of the coil and its orientation. The shunts may also be used to tune the coil according to the deduced frequencies of the unconstrained resonance and the desired frequency and orientation by adjusting the reactance of the shunts. A shunt having a variable reactance and a switch for shorting the RF coil as required uses a PIN diode in combination with a variable reactance.

REFERENCES:
patent: 4638253 (1987-01-01), Jaskolski et al.
patent: 4680548 (1987-07-01), Edelstein et al.
patent: 4799016 (1989-01-01), Rezvani
patent: 4820985 (1989-04-01), Eash
patent: 4820987 (1989-04-01), Mens
patent: 4833409 (1989-05-01), Eash

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