Patent ID: 7902822
Filing Date: 2011-03-08
Classification: G01R

Abstract:
1. A method for adjusting a B1 field in a magnetic resonance apparatus, comprising the steps of: for each of a plurality of measurement subjects, operating a magnetic resonance data acquisition unit to acquire morphological magnetic resonance measurement data from a subject and, from the morphological magnetic resonance measurement data for that subject, automatically identifying in a computerized processor, a position of the subject relative to a coordinate system in which a position of an RF emitter of the magnetic resonance apparatus is identifiable; for each subject, operating a magnetic resonance data acquisition unit to acquire three-dimensional subject data; from the three-dimensional subject data, automatically determining in a computerized processor, respective tissue types in the subject, and segmenting the three-dimensional subject data representing the subject into respective regions dependent on the respective tissue types; in a computerized processor, for each tissue type for each subject, associating known dielectric properties therewith; compiling an electronic data base in a memory for all of said subjects by, for each position of each subject, making entries for the respective segmentation regions and the dielectric properties associated therewith; using said data base, operating a magnetic resonance data acquisition unit to acquire an RF simulation for said RF emitter in which at least one of a resulting electrical field spatial distribution and a B1 field spatial distribution is automatically generated as a simulation result, and entering the simulation result into the data base; and for a subsequent resonance examination of a subject using said RF emitter in said magnetic resonance apparatus, obtaining magnetic resonance data from that subject by operating a magnetic resonance data acquisition unit using the data base containing said simulation result to automatically determine an electrical field spatial distribution, an SAR distribution, and an optimized current distribution for said RF emitter, that adjust the B1 field for said subsequent examination.