Enhanced decoupling of MRI RF coil pairs during RF tuning of MRI

Details Enhanced decoupling of MRI RF coil pairs during RF tuning of MRI Enhanced decoupling of MRI RF coil pairs during RF tuning of MRI

1987-11-02

1989-08-08

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324322, G01R 3320

Patent

active

048556807

ABSTRACT:
Frequency tuning and coupling capacitances in MRI RF receive coils are typically realized, at least in part, as reverse biased varactor diodes. During RF tuning of the transmit coil (i.e., so as to achieve resonance and matched impedance conditions), at least some if not all of the varactors associated with the receive coil are forward biased so as to simultaneously maximize detuning of the receive coil to resonant frequencies removed as far as possible from that of the transmitter coil being tuned while also then substantially reducing the Q of the receive coil.

REFERENCES:
patent: 4207530 (1980-06-01), Gallagher
patent: 4620155 (1986-10-01), Edelstein
patent: 4714886 (1987-12-01), Halpern

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