Patent ID: 7199585

Claim:
Method for shimming a main magnetic field in a magnetic resonance device, the method comprising the following steps: a) generating at least one spatially selective radio frequency pulse (RF) for exciting nuclear spin magnetization within a restricted region of the examination volume of the magnetic resonance device; b) acquiring a magnetic resonance signal that is sensitive to the homogeneity of the main magnetic field; c) applying electric currents to a shim coil arrangement of the magnetic resonance device such that the main magnetic field is adjusted in accordance to the properties of the magnetic resonance signal acquired in step b); characterized in that the electric currents applied to the shim coil arrangement are at least partially switched off during the generation of the spatially selective radio frequency pulse in step a) and switched on during the acquisition of the magnetic resonance signal in step b) wherein steps a) to c) are repeated such that the homogeneity of the main magnetic field is optimized iteratively.