Abstract: In a method for controlling a radio-frequency device, and a magnetic resonance tomography system and a radio-frequency control device wherein the method is implemented, the RF device of a magnetic resonance tomography system is emitted during a magnetic resonance measurement of an examination subject that is moving relative to the transmission field of the RF device. The RF device emits RF pulses at chronological intervals, and measurement values are measured at chronological intervals. At chronological intervals, position values are determined that represent a current position of the examination subject relative to the transmission field. On the basis of the measurement values and the position values, exposure values are determined that represent a physiological degree of effectiveness that the RF pulses have on the subject exposed to the RF pulses. Based on a multiplicity of exposure values, exposure control values are respectively formed.

Abstract: In a method, device and magnetic resonance tomography system for monitoring a radio-frequency apparatus in which radio-frequency pulses are emitted at temporal intervals and in which measurement values representing the power of the radio-frequency pulses are measured at temporal intervals, the measurement values are used to determine exposure values that represent a physiological effect that the radio-frequency pulses have on a subject exposed to the radio-frequency pulses. Based on a number of exposure values, exposure-monitoring values are respectively formed and the radio-frequency apparatus is limited in function if an exposure-monitoring value reaches or exceeds an exposure limit value.

Abstract: In a method for controlling a radio-frequency device, and a magnetic resonance tomography system and a radio-frequency control device wherein the method is implemented, the RF device of a magnetic resonance tomography system is emitted during a magnetic resonance measurement of an examination subject that is moving relative to the transmission field of the RF device. The RF device emits RF pulses at chronological intervals, and measurement values are measured at chronological intervals. At chronological intervals, position values are determined that represent a current position of the examination subject relative to the transmission field. On the basis of the measurement values and the position values, exposure values are determined that represent a physiological degree of effectiveness that the RF pulses have on the subject exposed to the RF pulses. Based on a multiplicity of exposure values, exposure control values are respectively formed.

Abstract: In a method for monitoring a radio-frequency power amplifier, and a radio-frequency device, and a radio-frequency monitoring device and a magnetic resonance tomography system, radio-frequency pulses are emitted at temporal intervals by the radio-frequency power amplifier, and measurement values that represent the power of the radio-frequency pulses are measured at temporal intervals. The measurement values are respectively loaded with a measurement error. Control values are respectively formed based on the sum of a number of measurement values loaded with measurement errors, and the radio-frequency power amplifier is limited in operation if and when a control value reaches or exceeds a predetermined limit control value.

Abstract: In a method for monitoring of a radio frequency power amplifier and a radio frequency device, a radio frequency monitoring device and magnetic resonance tomography system operable according to the method, radio frequency pulses emitted by a radio frequency power amplifier and are transmitted into a human subject by a transmission coil at temporal intervals. Measurement values that represent the power of the radio frequency pulses are measured at temporal intervals, and varying, predetermined power limit values are determined at temporal intervals. A control value representing the radio frequency dose emitted in a time window is determined based on a number of measurement values measured in the time window. Likewise, a limit control value representing a dose limit value allowed in the appertaining time window is determined based on the power limit values determined in the appertaining time window.