Patent ID: 6163240
Filing Date: 2000-12-19
Classification: G01R,H01F

Abstract:
Electromagnetic apparatus for use in an MRI device, the apparatus comprising:a permanent magnet assembly having a first surface defining a first side of said permanent magnet assembly and a second surface defining a second side of said permanent magnet assembly opposed to said first side, for producing a predetermined volume of substantially uniform magnetic field extending in a first direction beyond said first surface;an energizable transmitting RF coil for producing an RF electromagnetic field within said volume, at least a portion of said RF coil is positioned adjacent said first surface of said permanent magnet assembly;an energizable z-gradient coil for producing a magnetic field gradient extending within said volume in said first direction parallel to a first axis;an energizable x-gradient coil for producing a magnetic field gradient extending within said volume parallel to a second axis orthogonal to said first axis; andan energizable y-gradient coil for producing a magnetic field gradient extending within said volume parallel to a third axis orthogonal to said first axis and to said second axis,wherein at least one of said x-gradient coil, y-gradient coil and z-gradient coil is positioned opposing said second surface of said permanent magnet assembly.