Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1992-01-23
1994-08-30
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
335216, 324319, H01F 500, H01F 722
Patent
active
053431820
ABSTRACT:
A magnet device for MRI system is provided with a main coil assembly including a plurality of ring-like main coils wound around a reel element and a sub-coil assembly including at least one pair of ring-like sub-coils wound around the reel element. All the coils are arranged symmetric with respect to an axial direction of the reel element. The sub-coils are disposed at axially inner predetermined positions apart from the axial outermost main coils. A coil driving element, provided in the device, makes the main coils generate a main magnetic field in the space and makes the sub-coils generate a magnetic field inverse to the main magnetic field to form a high-uniform static magnetic field as a diagnostic space. Magnetomotive forces of the main coils and sub-coils are adjusted so that the diagnostic space having a longer radial axis than its longitudinal axis is formed in the cylindrical space.
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Barrera R.
Kabushiki Kaisha Toshiba
Picard Leo P.
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