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Method and apparatus for selective adjustment of RF coil size for magnetic resonance imaging

  • US 4,897,604 A
  • Filed: 02/21/1989
  • Issued: 01/30/1990
  • Est. Priority Date: 02/21/1989
  • Status: Expired due to Term
First Claim
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1. An MRI RF receiver coil comprising:

  • a solenoidal inductive coil having plural conductor turns;

    mated conductive connectors separably connecting each of said turns across a predetermined joint area;

    an RF tuning capacitance connected with said coil and having a predetermined adjustable tuning range for tuning the coil to a predetermined resonant RF frequency when loaded by the presence of an object to be imaged within said coil; and

    a bridge element having plural bridge conductors thereacross with conductive connectors for mating separable serial connection with the conductive connectors of each of said turns within said joint area thereby expanding the size of said coil;

    said bridge element having a sufficiently low net impedance when added to said coil that said RF turning capacitance remains capable of tuning the loaded expanded coil to resonance.

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