초록 ▼

Magnetic apparatus for MRI/MRT probes and methods for construction thereof are disclosed. One embodiment includes a pair of opposed magnet assemblies defining an open region therebetween, a transmitting RF coil having at least a portion thereof disposed within the open region, at least one receiving

Magnetic apparatus for MRI/MRT probes and methods for construction thereof are disclosed. One embodiment includes a pair of opposed magnet assemblies defining an open region therebetween, a transmitting RF coil having at least a portion thereof disposed within the open region, at least one receiving RF coil disposed within the open region and X,Y and Z gradient coils. At least one of the X,Y and Z gradient coils is disposed outside of the open region. Another embodiment of the apparatus includes a single magnet assembly having a first surface and a second surface opposing the first surface, a transmitting RF coil having at least a portion thereof opposing the first surface, at least one receiving RF coil and X,Y and Z gradient coils. At least one of the X,Y and Z gradient coils opposes the second surface. In another embodiment the magnet assembly generates a permanent z-gradient magnetic field and therefore includes only X and Y gradient coils, at least one of which opposes the second surface. The apparatuses may also include one or more shim coils.

대표청구항 ▼

[ What is claimed is:] [1.] 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

[ What is claimed is:] [1.] 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.