TREATMENT PLANNING DEVICE, PARTICLE BEAM THERAPY SYSTEM AND METHOD FOR DETERMINING SCANNING ROUTE OF CHARGED PARTICLE BEAM

摘要

A scanning candidate route extracting unit which extracts plural candidates of scanning routes in which each of the scanning routes connects all spot positions in one layer is provided, in an evaluation function using necessary scanning time Tk and weight coefficient wk for a kth partial route among partial routes which are routes between the spot positons which are adjacent on one of the plural candidates of scanning routes, and number n of spot in the layer, wk with respect to a partial route which passes through affected tissue is set to be 1, wk with respect to a partial route which passes through normal tissue is set to be bigger than 1, and wk with respect to a partial route which passes through an important internal organ is set to be bigger than wk with respect to a partial route which passes through normal tissue.

主权项

1. A treatment planning device by which a scanning route of a charged particle beam of a particle beam therapy system is determined, wherein the particle beam therapy system comprises an X-directional scanning electromagnet and a Y-directional scanning electromagnet for deflecting a charged particle beam in an X-direction and a Y-direction which are two perpendicular directions to a traveling direction of the charged particle beam so as for the charged particle beam to move and stay repeatedly and the charged particle beam is irradiated onto an affected part of a patient which is an irradiation objective,
wherein the treatment planning device comprises a spot position storing unit which stores spot positions which are arranged in a grid shape in the X-direction and the Y-direction for each layer, which are points set in the affected part where the charged particle beam stays, a scanning candidate route extracting unit which extracts plural candidates of scanning routes in which each of the scanning routes connects all spot positions in one layer which are stored in the spot position storing unit, a scanning route evaluating unit which defines an evaluation function JJ=∑k=1n-1(wkTk)using a necessary scanning time Tk and a weight coefficient wk for a kth partial route among partial routes which are routes between the spot positons which are adjacent on one of plural scanning routes which are extracted by the scanning candidate route extracting unit, and number n of spots in the layer, and calculates the evaluation function J regarding each of plural scanning candidate routes which are extracted by the scanning candidate route extracting unit by setting the weight coefficient wk with respect to a partial route which passes through affected tissue to be 1, the weight coefficient wk with respect to a normal tissue to be larger than 1 and the weight coefficient wk with respect to a partial route which passes through an important internal organ to be larger than the weight coefficient wk with respect to a partial route which passes through the normal tissue and
a scanning route determining unit which determines a scanning route which is used for therapy based on a value of the evaluation function J which is calculated by the scanning route evaluating unit.