RF coil for MRI with self-tracking ganged coupling capacitors

Details RF coil for MRI with self-tracking ganged coupling capacitors RF coil for MRI with self-tracking ganged coupling capacitors

1987-10-07

1988-11-08

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, 333 32, 361289, G01R 3320

Patent

active

047836296

ABSTRACT:
An RF coil for a magnetic resonance imaging device using nuclear magnetic resonance phenomena includes self-tracking ganged coupling capacitors which provide impedance matching and also tune out coil inductance to establish resonance at the RF operating frequency. At least one variable capacitor connected in parallel with the RF coil is mechanically ganged to at least one variable capacitor connected in series to the RF coil. The parallel and series capacitances are initially set to achieve resonance at a desired operating frequency. As the shaft of one variable capacitor is rotated in a first direction through a given angle, the shaft of the other variable capacitor rotates in the opposite direction through the same angle, thereby varying the ratio (but not the sum) of parallel and series capacitances. A servo controller connected to a standing wave ratio detector automatically adjusts the ratio of parallel to series capacitances to optimize impedance matching between the source and the RF coil.

REFERENCES:
patent: 4620155 (1986-10-01), Edelstein
patent: 4641097 (1987-02-01), Bottomley et al.
patent: 4649348 (1987-03-01), Flugan
patent: 4728896 (1988-03-01), Bendall et al.
patent: 4742304 (1988-05-01), Schnall et al.

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