Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1987-09-01
1988-11-01
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324318, G01R 3320
Patent
active
047822988
ABSTRACT:
A detuning/decoupling arrangement for a Magnetic Resonance Imaging (MRI) system quadrature RF coil arrangement (of the type using the nuclear magnetic resonance, or NMR, phenomenon) uses switching diodes to selectively connect and disconnect portions of a segmented RF coil in response to a DC control signal. The DC control signal selectively forward biases and reverse biases the switching diodes. The DC control current flows through the RF coil itself, through the diodes, and then through the center conductor of a semi-rigid transmission line disposed in proximity to the RF coil. Because the DC current flowing through the transmission line is equal and opposite to the DC current flowing through the RF coil, the net magnetic field generated by the DC current flow is approximately zero--eliminating artifacts in the MRI image that would otherwise be generated due to continuous DC current flowing whenever the coil is being used to transmit or receive RF.
REFERENCES:
patent: 4620155 (1986-10-01), Edelstein
patent: 4649348 (1987-03-01), Flugan
patent: 4717881 (1988-01-01), Flugan
Arakawa Mitsuaki
McCarten Barry M.
Levy Stewart J.
O'Shea Kevin D.
The Regents of the University of California
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