Patent ID: 8808341

Claim:
A respiratory induction apparatus for inducing respiration of a patient in particle beam therapy, comprising: a desired respiratory signal generating unit that generates a desired respiratory signal for inducing respiration of the patient; a real respiration measurement unit that measures real respiration of the patient and outputs a real respiratory signal obtained through the measurement; a respiration evaluation unit in which by, as a calculation unit, utilizing data of a single period of the desired respiratory signal, there is calculated a pair of coefficients, of trigonometric functions, which correspond to the 1st-order terms by means of Fourier series expansion of the desired respiratory signal and the real respiratory signal, which is acquired in synchronization with the desired respiratory signal, and there are performed comparisons between the respective gains and between the respective phases, which are obtained from the calculated coefficients, so that there is evaluated a misalignment of the real respiration from the desired respiratory signal; and a modification information generating unit that generates modification information to modify the misalignment of the real respiration, based on the evaluation results by the respiration evaluation unit.