Patent ID: 7403003

Claim:
An assembly for magnetic field generation in a magnetic resonance tomography apparatus comprising: a superconducting magnet device that generates a basic magnetic field, said superconducting magnetic device comprising a superconducting coil having a plurality of windings; a vacuum vessel that surrounds said superconducting magnet device, said vacuum vessel having a non-conductive wall; a superconducting gradient field device operable, if not in a magnetic field above an impairing magnetic field strength, to generate a rapidly switched gradient field; and said non-conductive wall of said vacuum vessel forming, in combination with said superconducting coil, a region between windings of said superconducting coil in which said superconducting gradient field device is disposed, and a magnetic field source that produces a reduced magnetic field in said region having a magnetic field strength below said impairing field strength to allow said operation of said superconducting gradient field device to generate said rapidly switched gradient fields.