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Antenna coupling circuit for magnetic resonance imaging

  • US 4,731,585 A
  • Filed: 02/24/1987
  • Issued: 03/15/1988
  • Est. Priority Date: 02/24/1987
  • Status: Expired due to Fees
First Claim
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1. A coupling circuit for coupling an inductive coil antenna of a magnetic resonance imaging system to receiver circuitry, said coupling circuit comprising:

  • capacitive means, coupled in parallel with said antenna, for providing capacitive reactance in said coupling circuit;

    resistive means, coupled in parallel with said antenna and with said capacitive means, for providing resistance R in said coupling circuit when the inductive reactance of said coupling circuit is equal to the capacitive reactance of said coupling circuit; and

    capacitive transformer means, coupled between said antenna and said receiver circuitry in series with said antenna, for transforming said resistance value R of said resistive means into a transformed resistance value R'"'"', thereby increasing the apparent resistance of said coupling circuit in parallel with said antenna.

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