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Shield for MR system RF coil provided with multiple capacitive channels for RF current flow

  • US 5,760,584 A
  • Filed: 08/16/1996
  • Issued: 06/02/1998
  • Est. Priority Date: 08/16/1996
  • Status: Expired due to Term
First Claim
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1. In an MR imaging system having an RF coil and one or more gradient coils, apparatus for shielding the gradient coils from an RF field generated by the RF coil which rotates around the axis thereof, said apparatus comprising:

  • an arrangement comprising a specified number of conductive cylinders in spaced-apart coaxial relationship;

    a cylinder formed of selected dielectric material respectively positioned in each space lying between every two of said conductive cylinders which are adjacent to each other in said arrangement;

    a pattern of conductive loops being formed in each of said conductive cylinders, each loop having an associated gap provided as a barrier to current flow; and

    said specified number of said conductive cylinders, and their respective angular orientations relative to one another, are selected to provide a plurality of closed paths for RF current induced by the RF field, wherein respective closed paths are established by capacitive coupling between a given conductive loop of a given conductive cylinder, and conductive loops of each of a plurality of other of said conductive cylinders.

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