Device and method for generating excitation pulses

1. A radio-frequency control system for a magnetic resonance tomography system, the radio-frequency control system comprising:

a controller; and

a radio-frequency power amplifier with amplification between a signal input and a signal output of the radio-frequency power amplifier that is dependent on a predetermined frequency response,

wherein the controller is configured to:

determine a control pulse for multislice excitation;

output the control pulse to the signal input of the radio-frequency power amplifier; and

weight the control pulse with the predetermined frequency response of the radio-frequency power amplifier to determine a high-frequency power value for the control pulse in dependence on the predetermined frequency response of the radio-frequency power amplifier from the control pulse.

2. The radio-frequency control system of claim 1 , wherein the controller is further configured to weight a nominal control pulse for the generation of the control pulse with a function that is inverse to the predetermined frequency response.

3. The radio-frequency control system of claim 1 , further comprising a power meter in signal connection with the signal output of the radio-frequency power amplifier,

wherein the controller is configured to determine the predetermined frequency response on a change of patient.

4. The radio-frequency control system of claim 2 , further comprising a power meter in signal connection with the signal output of the radio-frequency power amplifier,

wherein the controller is configured to determine the predetermined frequency response on a change of patient.

5. The radio-frequency control system of claim 1 , wherein the controller is further configured to:

compare the determined high-frequency power value with a predetermined limit radio-frequency value; and

interrupt the output of the control pulse for multislice excitation to the signal input of the radio-frequency power amplifier when the limit radio-frequency value is exceeded by the high-frequency power value.

6. The radio-frequency control system of claim 2 , wherein the controller is further configured to:

compare the determined high-frequency power value with a predetermined limit radio-frequency value; and

interrupt the output of the control pulse for multislice excitation to the signal input of the radio-frequency power amplifier when the limit radio-frequency value is exceeded by the high-frequency power value.

7. The radio-frequency control system of claim 3 , wherein the controller is further configured to:

compare the determined high-frequency power value with a predetermined limit radio-frequency value; and

interrupt the output of the control pulse for multislice excitation to the signal input of the radio-frequency power amplifier when the limit radio-frequency value is exceeded by the high-frequency power value.

8. A method for operating a magnetic resonance tomography system, wherein the magnetic resonance tomography system comprises a radio-frequency control system, the radio-frequency control system comprising a controller and a radio-frequency power amplifier with amplification between a signal input and a signal output of the radio-frequency power amplifier that is dependent on a predetermined frequency response, the method comprising: determining, by the controller, a control pulse for multislice excitation; outputting the control pulse to the signal input of the radio-frequency power amplifier; determining a high-frequency power value for the control pulse in dependence on the predetermined frequency response of the radio-frequency power amplifier from the control pulse or a nominal control pulse that is independent of the predetermined frequency response, from which the control pulse is generated; and generating the control pulse, generating the control pulse comprising weighting, by the radio-frequency control system, the nominal control pulse with a function that is inverse to the frequency response.

9. The method of claim 8 , wherein determining the high-frequency power value comprises weighting, by the radio-frequency control system, the control pulse with the frequency response of the radio-frequency power amplifier.

10. The method of claim 8 , wherein the radio-frequency control system comprises a power meter in signal connection with the signal output of the radio-frequency power amplifier, and

wherein the method further comprises determining, by the power meter, the predetermined frequency response on a change of patient.

11. The method of claim 8 , further comprising:

comparing, by the radio-frequency control system, the determined high-frequency power value with a predetermined limit radio-frequency value; and

interrupting the outputting of the control pulse for multislice excitation to the signal input of the radio-frequency power amplifier when the limit radio-frequency value is exceeded by the high-frequency power value.

12. In a non-transitory computer-readable storage medium that stores instructions executable by a controller of a radio-frequency control system to operate a magnetic resonance tomography system, the magnetic resonance tomography system comprising the radio-frequency control system, the radio-frequency control system comprising a radio-frequency power amplifier with amplification between a signal input and a signal output of the radio-frequency power amplifier that is dependent on a predetermined frequency response, the instructions comprising: determining, by the controller, a control pulse for multislice excitation; outputting the control pulse to the signal input of the radio-frequency power amplifier; determining a high-frequency power value for the control pulse in dependence on the predetermined frequency response of the radio-frequency power amplifier from the control pulse or a nominal control pulse that is independent of the frequency response, from which the control pulse is generated; and generating the control pulse, generating the control pulse comprising weighting, by the radio-frequency control system, the nominal control pulse with a function that is inverse to the frequency response.

13. The non-transitory computer-readable storage medium of claim 12 , wherein determining the high-frequency power value comprises weighting, by the radio-frequency control system, the control pulse with the frequency response of the radio-frequency power amplifier.

14. The non-transitory computer-readable storage medium of claim 12 , wherein the radio-frequency control system comprises a power meter in signal connection with the signal output of the radio-frequency power amplifier, and

wherein the instructions further comprise determining, by the power meter, the predetermined frequency response on a change of patient.

15. The non-transitory computer-readable storage medium of claim 12 , wherein the instructions further comprise:

comparing, by the radio-frequency control system, the determined high-frequency power value with a predetermined limit radio-frequency value; and

interrupting the outputting of the control pulse for multislice excitation to the signal input of the radio-frequency power amplifier when the limit radio-frequency value is exceeded by the high-frequency power value.

16. A radio-frequency control system for a magnetic resonance tomography system, the radio-frequency control system comprising:

a controller;

a radio-frequency power amplifier with amplification between a signal input and a signal output of the radio-frequency power amplifier that is dependent on a predetermined frequency response; and

a power meter in signal connection with the signal output of the radio-frequency power amplifier,

wherein the controller is configured to:

determine a control pulse for multislice excitation;

output the control pulse to the signal input of the radio-frequency power amplifier;

determine the predetermined frequency response on a change of patient; and

determine a high-frequency power value for the control pulse in dependence on the predetermined frequency response of the radio-frequency power amplifier from the control pulse or a nominal control pulse that is independent of the frequency response from which the control pulse is generated.

17. The radio-frequency control system of claim 16 , wherein the controller is further configured to:

compare the determined high-frequency power value with a predetermined limit radio-frequency value; and

interrupt the output of the control pulse for multislice excitation to the signal input of the radio-frequency power amplifier when the limit radio-frequency value is exceeded by the high-frequency power value.