PROBLEM TO BE SOLVED: To provide a dose evaluation technology in radiation therapy capable of reflecting a positional deviation of a patient being irradiated in real time based on a high-speed and high-precision dose calculation.SOLUTION: A dose evaluation device 10 includes: an acquisition part 11 for acquiring data on a three-dimensional image 12 a definition part 13 for defining an evaluation region 46 (461,462...) a setting part 16 for setting a plurality of connection surfaces 47 (471,472...) a derivation part 21 for deriving a response function based on Monte Carlo transportation calculation code 20 a holding part for holding data on particle flux distribution information 35 an initial recognition part 24 of a representative point 51 a detection part 27 for detecting a movement ratio in a rotation direction and a translation direction of a patient 40 in real time a tracking part 28 for tracking the representative point 51 based on the movement ratio and a calculation part 29 for acquiring a particle flux corresponding to the representative point 51 from the particle flux distribution information 35, and calculating a dose ratio of the evaluation region 46 based on the response function.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】高速かつ高精度な線量計算に基づいて、照射中の患者の位置ずれをリアルタイムに反映することができる、放射線治療における線量評価技術を提供する。【解決手段】線量評価装置10は、立体像12をデータ取得する取得部11と、評価領域46(461,462…)を定義する定義部13と、複数の接続表面47(471,472…)を設定する設定部16と、応答関数をモンテカルロ輸送計算コード20に基づき導出する導出部21と、粒子束分布情報35をデータ保持する保持部と、代表点51の初期認識部24と、患者40の回転方向及び並進方向の移動率をリアルタイムに検出する検出部27と、代表点51を移動率に基づいて追跡する追跡部28と、代表点51に対応する粒子束を粒子束分布情報35から取得して応答関数に基づき評価領域46の線量率を演算する演算部29と、を備える。【選択図】 図1
