Patent ID: 7365540

Claim:
A coaxial magnet configuration for the production of a magnetic field which is suitable for the measurement of magnetic resonance in an investigational volume, the magnet configuration comprising: at least one superconducting solenoid coil or a plurality of radially nested solenoid coils, said solenoid coil having windings disposed in a radial region about an axis of the magnet configuration between r 1 and r 2 , wherein r 1 <r 2 ; and at least one rotationally symmetric magnet body made from a ferromagnetic material, said magnet body surrounding said windings and extending through a radial region between r 3 and r 4 , wherein r 3 <r 4 , r 2 <r 3 <1.3 r 2 , and r 4 >1.3 r 3 , said rotationally symmetric magnet body being structured, dimensioned, and positioned to render the magnetic field in the investigational volume homogenous and to substantially suppress magnetic fringe fields outside of the magnet configuration.