Patent ID: 9335395
Filing Date: 2016-05-10
CPC Classification: G01R

Claim Text:
1. A method for frequency calibration of a magnetic resonance system with respect to a volume section of an examination subject containing an unknown number of substances, said method comprising: operating a plurality of components of a magnetic resonance data acquisition unit in order to excite nuclear spins in a volume section of an examination subject by irradiating said volume section with radio-frequency (RF) pulses; detecting, at respectively different times after exciting said nuclear spins, a plurality of echo signals from the volume section that arise in said volume section due to said excitation of said nuclear spins; supplying said echo signals to a computerized processing system and, in said computerized processing system, automatically determining, for each of said echo signals, spectral information; in said computerized processing system, detecting at least one peak value in the respective spectral information for each of the echo signals; in said computerized processing system, automatically determining, for each peak value, a relaxation time of the nuclear spins that produced the respective echo signals from which the respective peak volume was detected; in said computerized processing system, for each peak value, determining a substance associated therewith dependent on the relaxation time identified for the respective peak value; and from said computerized processing system, implementing a frequency adjustment of at least one of said plurality of components of said magnetic resonance data acquisition unit operated to excite said nuclear spins, dependent on the peak value determined for at least one of said substances, for implementing another excitation of said nuclear spins in said volume section of said examination subject.