National Institutes for Quantum and Radiological Science and Technology

Nobuyuki Kanematsu

Taku Inaniwa

Takuji Furukawa

Koji Noda

Toshiyuki Shirai

Provided is an irradiation planning apparatus including: a three-dimensional CT value data acquisition unit (); a prescription data input processing unit () which acquires prescription data; a stopping power ratio conversion unit () and a nuclear reaction effective density conversion unit () which respectively generate first conversion data () and second conversion data () on the basis of three-dimensional CT value data; and a calculation unit () which calculates a dose distribution on the basis of the prescription data, the first conversion data (), and the second conversion data (), wherein the stopping power ratio conversion unit () and the nuclear reaction effective density conversion unit () perform correction processing for correcting data obtained from the three-dimensional CT value data, using a physical quantity indicative of a likelihood of spalling particles of incident charged particle beam (), and then determine the dose distribution. Thus, in calculation of a dose distribution in a body in particle beam irradiation planning, a dose error introduced by a difference between the probability of nuclear reaction initiated, in a body, by incident particles and the probability of nuclear reaction initiated, in water, by incident particles is simply and accurately corrected.

Irradiation planning apparatus and irradiation plan correction method

A planning apparatus () determines irradiation parameter data () for a charged particle irradiation system (), which radiates charged particles generated by an ion source () to a target () by accelerating the charged particles by means of a linear accelerator () and a synchrotron (). The planning apparatus is provided with: a planning program (), which determines the irradiation parameter data () with respect to one target () by combining charged particles of a plurality of kinds of ion species; and a CPU () for executing the planning program. Consequently, the irradiation planning apparatus capable of performing irradiation with desirable dose distribution with respect to the target, the irradiation planning program, an irradiation plan determining method, and the charged particle irradiation system are provided.

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Chiba, Japan

Nobuyuki Kanematsu