Magnet arrangement comprising a superconducting magnet coil system and a magnetic field shaping device for high-resolution magnetic resonance spectroscopy

Abstract

A magnet arrangement comprising a superconducting magnet coil system (C) for generating a magnetic field in the direction of a z axis in a working volume (AV) disposed on the z axis about z=0, wherein the field of the magnet coil system (C) in the working volume (AV) comprises at least one inhomogeneous contribution Hn·zn with n≧2 whose contribution to the total field strength on the z axis about z=0 varies with the nth power of z, and wherein a field shaping device (P) of magnetic material is provided, which is substantially cylindrically symmetrical with respect to the z axis, is characterized in that the magnet coil system (C) is provided for use in an apparatus for high-resolution magnetic resonance spectroscopy and the field shaping device (P) has, at least partially, a radial separation from the z axis of less than 80 mm and compensates for at least one of the inhomogeneous field contributions Hn·zn of the magnet coil system (C) by at least 50%, wherein at least one additional coil system (S) is provided which acts as a shim device in the magnet arrangement. This permits realization of a field shaping device from magnetic material of a suitable geometry such that at least part of the notch structures for field homogenization can be omitted in the magnet coil system.

Dependencies are inferred from the claim text.