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Magnetic apparatus for MRI

  • US 20020050895A1
  • Filed: 12/18/2000
  • Published: 05/02/2002
  • Est. Priority Date: 09/25/1997
  • Status: Active Grant
First Claim
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1. Electromagnetic apparatus for use in an MRI device, the probe comprising:

  • a first permanent magnet assembly having a first surface and a second surface thereof;

    a second permanent magnet assembly having a third surface and a fourth surface thereof, said second permanent magnet assembly opposing said first permanent magnet assembly such that said second surface and said third surface define an open region therebetween, for producing a predetermined volume of substantially uniform magnetic field extending in a first direction parallel to a first axis, said volume is disposed within said open region;

    an energizable transmitting RF coil for producing an RF electromagnetic field within said volume;

    an energizable z-gradient coil for producing a magnetic field gradient extending within said open region in said first direction and parallel to said first axis;

    an energizable x-gradient coil for producing a magnetic field gradient extending within said open region in parallel to a second axis orthogonal to said first axis; and

    an energizable y-gradient coil for producing a magnetic field gradient extending within said open region in parallel to a third axis orthogonal to said first axis and said second axis, wherein at least one of said x-gradient coil, y-gradient coil and z-gradient coil is positioned outside of said open region.

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