| 摘要 |
Provided is an irradiation planning apparatus comprising: a three-dimensional CT value data acquisition unit 36; a prescription data input processing unit 32 which acquires prescription data; a stopping power ratio conversion unit 37 and a nuclear reaction effective density conversion unit 38 which create first conversion data 41 and second conversion data 42 on the basis of three-dimensional CT value<b/>data; and a calculation unit 33 which obtains dose distribution on the basis of the prescription data, the first conversion data 41, and the second conversion data 42, wherein the stopping power ratio conversion unit 37 and the nuclear reaction effective density conversion unit 38 execute correction processing of correcting, using a physical quantity indicative of easiness in crushing particles of incident charged particle beam 3, data obtained from the three-dimensional CT value<b/>data, and then, the dose distribution is obtained. Accordingly, in calculation of dose distribution in a body in particle beam irradiation planning, dose error, due to the difference between the probability of nuclear reaction caused in the body by incident particles and the probability of nuclear reaction caused in water by incident particles, is corrected simply and accurately. |
