Particle therapy system

1. A particle therapy system comprising:

a particle beam generator for generating a particle beam;

an irradiation nozzle arranged in a treatment room and irradiating a target with the particle beam, the irradiation nozzle having a dosimeter arranged at a position passed by the particle beam;

a particle beam transport system for communicating the particle beam generator with the irradiation nozzle;

an X-ray imaging device arranged in the treatment room and imaging a position of the target through irradiation with X-rays; and

a control apparatus configured to:

stop particle beam irradiation before X-ray irradiation performed by the X-ray imaging device and resume the particle beam irradiation upon completion of the X-ray irradiation by the X-ray imaging device;

exclude a measurement result of scattered X-rays derived from the X-ray imaging device by subtracting an integrated value of signals output from the dosimeter during a period in which the particle beam irradiation is stopped from an integrated value of signals output from the dosimeter; and

determine whether a planned dose has been emitted based on a result of the exclusion.

2. The particle therapy system according to claim 1 ,

wherein the control apparatus is further configured to:

stop the particle beam irradiation before the X-ray irradiation and to resume the particle beam irradiation upon completion of the X-ray irradiation;

integrate the signals output from the dosimeter;

integrate the signals output from the dosimeter while the particle beam irradiation is being stopped;

subtract an integrated value of a subtraction integration counter from an integrated value of an integration counter; and

determine whether a planned dose has been emitted based on a result of computation by subtracting the integrated value of the subtraction integration counter from the integrated value of the integration counter.

3. The particle therapy system according to claim 2 , the particle therapy system dividing the target into a plurality of irradiation regions each constituting a spot and irradiating each spot with the particle beam,

wherein the control apparatus further includes an irradiation controller and an X-ray imaging controller for outputting a signal to the irradiation controller after the X-ray irradiation has ended until before a predetermined time of the X-ray irradiation is resumed; and

wherein, when the signal from the X-ray imaging controller is interrupted, the irradiation controller performs control to stop an update of a current spot position with a next spot position, the current spot position being irradiated with the particle beam while the signal is being received.

4. The particle therapy system according to claim 2 ,

wherein the control apparatus further includes an irradiation controller and an X-ray imaging controller for outputting a signal to the irradiation controller after the X-ray irradiation has ended until the X-ray irradiation is resumed; and

wherein, when the signal from the X-ray imaging controller is interrupted, the irradiation controller performs control immediately to stop the particle beam irradiation.

5. The particle therapy system according to claim 1 ,

wherein the control apparatus excludes the measurement result of the scattered X-rays by performing control to separate chronologically a timing of the particle beam irradiation from a timing of an X-ray irradiation performed by the X-ray imaging device.

6. The particle therapy system according to claim 5 ,

wherein the control apparatus integrates signals from the dosimeter only during a period in which the particle beam is emitted.

7. The particle therapy system according to claim 4 ,

wherein the irradiation controller has a dose control system that excludes the measurement result of scattered X-rays derived from the X-ray imaging device from a measurement result obtained using the dosimeter.

8. The particle therapy system according to claim 7 ,

wherein the dose control system includes the integration counter and the subtraction integration counter.

9. The particle therapy system according to claim 3 ,

wherein the irradiation controller includes a dose control system that excludes the measurement result of scattered X-rays derived from the X-ray imaging device from a measurement result obtained using the dosimeter.

10. The particle therapy system according to claim 9 ,

wherein the dose control system includes the integration counter and the subtraction integration counter.

11. The particle therapy system according to claim 2 ,

wherein the control apparatus includes an irradiation controller including a dose control system that excludes the measurement result of scattered X-rays derived from the X-ray imaging device from a measurement result obtained using the dosimeter.

12. The particle therapy system according to claim 11 ,

wherein the dose control system includes the integration counter and the subtraction integration counter.

13. A particle therapy system comprising:

a particle beam generator for generating a particle beam;

an irradiation nozzle arranged in a treatment room and irradiating a target with the particle beam, the irradiation nozzle having a dosimeter arranged at a position passed by the particle beam;

a particle beam transport system for communicating the particle beam generator with the irradiation nozzle;

an X-ray imaging device arranged in the treatment room and imaging a position of the target through irradiation with X-rays; and

a control apparatus configured to:

exclude a measurement result of scattered X-rays derived from the X-ray imaging device from a measurement result obtained using the dosimeter; and

determine whether a planned dose has been emitted based on a result of the exclusion;

wherein the control apparatus excludes the measurement result of the scattered X-rays by subtracting the measurement result of the scattered X-rays from the measurement result obtained using the dosimeter;

wherein the target is divided into a plurality of irradiation regions each constituting a spot and irradiating each spot with the particle beam;

wherein the control apparatus stops particle beam irradiation before X-ray irradiation performed by the X-ray imaging device and resumes the particle beam irradiation upon completion of the X-ray irradiation by the X-ray imaging device, the control apparatus excluding the measurement result of the scattered X-rays derived from the X-ray imaging device by subtracting from an integrated value of signals output from the dosimeter an integrated value of signals output from the dosimeter during a period in which the particle beam irradiation is stopped;

wherein the control apparatus is further configured to:

stop the particle beam irradiation before the X-ray irradiation and to resume the particle beam irradiation upon completion of the X-ray irradiation;

integrate the signals output from the dosimeter;

integrate the signals output from the dosimeter while the particle beam irradiation is being stopped;

subtract an integrated value of a subtraction integration counter from an integrated value of an integration counter; and

determine whether a planned dose has been emitted based on a result of computation by subtracting the integrated value of the subtraction integration counter from the integrated value of the integration counter.

14. The particle therapy system according to claim 13 ,

wherein the control apparatus further includes an irradiation controller and an X-ray imaging controller for outputting a signal to the irradiation controller after the X-ray irradiation has ended until before a predetermined time of the X-ray irradiation is resumed; and

wherein, when the signal from the X-ray imaging controller is interrupted, the irradiation controller performs control to stop an update of a current spot position with a next spot position, the current spot position being irradiated with the particle beam while the signal is being received.

15. The particle therapy system according to claim 13 ,

wherein the control apparatus further includes an irradiation controller and an X-ray imaging controller for outputting a signal to the irradiation controller after the X-ray irradiation has ended until the X-ray irradiation is resumed; and

wherein, when the signal from the X-ray imaging controller is interrupted, the irradiation controller performs control immediately to stop the particle beam irradiation.

16. The particle therapy system according to claim 15 ,

wherein the irradiation controller has a dose control system that excludes the measurement result of scattered X-rays derived from the X-ray imaging device from the measurement result obtained using the dosimeter.

17. The particle therapy system according to claim 15 ,

wherein the dose control system includes the integration counter and the subtraction integration counter.

18. The particle therapy system according to claim 14 ,

wherein the irradiation controller includes a dose control system that excludes the measurement result of scattered X-rays derived from the X-ray imaging device from the measurement result obtained using the dosimeter.

19. The particle therapy system according to claim 18 ,

wherein the dose control system includes the integration counter and the subtraction integration counter.

20. The particle therapy system according to claim 13 ,

wherein the irradiation controller includes a dose control system that excludes the measurement result of scattered X-rays derived from the X-ray imaging device from the measurement result obtained using the dosimeter.