Patent ID: 6825663
Filing Date: 2004-11-30
Classification: G01R

Abstract:
A method for operating a magnetic resonance apparatus comprising the steps of:operating a basic field magnet of a magnetic apparatus for generating a basic magnetic field; operating a gradient coil system of said magnetic resonance apparatus for generating at least one gradient field, said gradient coil system being subject to a change in at least one of shape and position during operation thereof; shimming said basic magnetic field with a plurality of ferromagnetic shim plates, disposed at said coil system, with a shimming effect for homogenizing said basic magnetic field, said change causing a change in said shimming effect; providing a plurality of heaters respectively in thermally conductive relation with said plurality of shim plates; obtaining an information signal during operation of said gradient coil system indicative of said change in at least one of shape and position of the gradient coil system; and regulating said heaters during operation of said gradient coil system dependent on said information signal for compensating said change in said shimming effect for substantially restoring said shimming effect for homogenizing said basic magnetic field.