A method for checking a high-frequency transmit device of a magnetic resonance tomography system, excitation vectors that represent high-frequency signal strengths on the individual transmit channels are determined for a plurality of time points or time periods. High-frequency exposure values absorbed in an examination object are determined in accordance with predetermined check rules on the basis of the excitation vectors. The high-frequency transmit device is restricted in function when an exposure check value that is based on at least one high-frequency exposure value reaches or exceeds a predetermined limit check value. The check rules are predetermined as a function of a current transmit mode of the high-frequency transmit device. The respective transmit mode of the high-frequency transmit device is verified on the basis of the excitation vectors. When a transmit mode change is detected, the check rules are changed, and/or the high-frequency transmit device is restricted in function.
