Antenna coupling circuit for magnetic resonance imaging

Details Antenna coupling circuit for magnetic resonance imaging Antenna coupling circuit for magnetic resonance imaging

1987-02-24

1988-03-15

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

328221, 307559, G01R 3320

Patent

active

047315857

ABSTRACT:
A coupling circuit for coupling an inductive coil antenna of a magnetic resonance imaging system to receiver circuitry is provided which includes capacitive circuitry, resistive circuitry, and capacitive transformer circuitry. The capacitive circuitry is coupled in parallel with the antenna to provide capacitive reactance to the coupling circuitry. Resisitive circuitry is coupled in parallel with the antenna and with the capacitive circuitry to provide resistance R in the coupling circuit when an AC voltage at the resonant frequency of the coupling circuit is applied. Capacitive transformer circuitry is coupled in series with the antenna for transforming the resistance value R of the resistive circuitry into a transformed resistance value R'. This increases the apparent resistance of the coupling circuit in parallel with the antenna without increasing the actual resistance and power consumption of the coupling circuit.

REFERENCES:
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patent: 3870926 (1975-03-01), Hughes
patent: 4129822 (1978-12-01), Traficante
patent: 4249137 (1981-02-01), Malchow
patent: 4327390 (1982-04-01), Despiney
patent: 4371846 (1983-02-01), Gamble
patent: 4620155 (1986-10-01), Edelstein
patent: 4628264 (1986-12-01), Rzedzian
patent: 4633181 (1986-12-01), Boesch
patent: 4649348 (1987-03-01), Flugan

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