Patent ID: 8035378

Claim:
An operating method for a magnetic resonance system comprising a plurality of individual transmission antennas that are respectively charged individually with transmission current to cause each individual transmission antenna to generate an individual excitation field in an examination volume of the magnetic resonance system, said individual excitation fields superimposing to form a total excitation field in an examination subject in said examination volume that causes magnetic resonance signals to be emitted from the subject, said method comprising the steps of: providing a determination device of the magnetic resonance system with a designation of a spatial distribution of an absorption rate of the examination subject in the examination volume with regard to absorption of energy of a type radiated by said individual transmission antennas; in said determination device, automatically determining a combination of amplitudes and phase positions for the respective transmission currents supplied to the individual transmission antennas relative to each other, to cause a power that is locally absorbed at a first point of the examination subject to satisfy a relative condition with respect to a power locally absorbed at a second point of the examination subject; from the determination device, communicating said combination of amplitudes and phase positioned to a control device; in said control device, generating respective transmission currents for the respective individual transmission antennas, to give the respective transmission currents phase positions relative to each other corresponding to the phase positions communicated by the determination device, and amplitudes that are scaled with a scaling factor that is uniform for all of said transmission currents relative to the amplitudes communicated by said determination device; in said determination device, determining a maximum absorbed power that occurs for the communicated combination of amplitudes and phase positions, and communicating said maximum absorbed power to said control device; providing said control device with a maximum allowable value of power that is locally absorbable by the examination subject; and in said control device, automatically determining said uniform scaling factor using said maximum allowable value and the communicated maximum absorbed power.