Patent ID: 6617853
Filing Date: 2003-09-09
Classification: G01R

Abstract:
A magnet device for high-resolution magnetic resonance spectroscopy, the device producing a magnetic field in a direction of a z-axis in a working volume disposed on the z axis about z=0, the device comprising:a superconducting magnet coil system, said magnet coil system producing a magnetic field in the working volume with at least one inhomogeneous contribution HnÂ·zn with n&gE;2, whose contribution to a total field strength on the z axis about z=0 varies with an nth power of z; a field shaping device of magnetic material, said field shaping device being substantially cylindrically symmetrical with respect to the z axis, at least a portion of said field shaping device having a radial separation from the z axis of less than 80 mm to compensate for said inhomogeneous contribution HnÂ·zn of said magnet coil system by at least 50%; and at least one additional coil system, said additional coil system functioning as a shim device.