Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1987-09-08
1988-08-09
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324318, G01R 3320
Patent
active
047630760
ABSTRACT:
A detuning/decoupling arrangement for a Magnetic Resonance Imaging (MRI) system RF coil arrangement (of the typing using the nuclear magnetic resonance, or NMR, phenomenon) uses switching diodes to selectively connect and disconnect portions of an RF resonant circuit in response to a DC control signal. The DC control signal selectively forward biases and reverse biases the switching diodes. The DC control current is fed to the resonant circuit along the same RF transmission line used to feed RF signals to/from the circuit. An in-line coaxial shielded RF choke connected to the RF transmission line isolates the DC control signals from the RF signals flowing on the same transmission line--reducing the number and complexity of isolation devices required on the ends of the transmission line to separate the RF and DC signals.
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Arakawa Mitsuaki
Crooks Lawrence E.
The Regents of the University of California
Tokar Michael J.
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