PROBLEM TO BE SOLVED: To reduce the acquisition frequency of positional information on an object of irradiation such as imaging of a transparent image and generate a model with higher accuracy at the time of generating a model indicating the position of the object of irradiation for radiation therapy.SOLUTION: A model generation apparatus includes: a reference model storage part which stores a reference model of the movement of the object of irradiation periodically moving a respiratory signal acquisition part which acquires a respiratory signal being a signal generated in synchronization with respiration a position information acquisition control part which makes an irradiation object position information acquisition device which acquires information indicating the position of the object of irradiation acquire information indicating the position of the object of irradiation at a prescribed timing indicated by a phase of the respiratory signal and a model generation part which generates an irradiation object position model indicating relation between the respiratory signal and the position of the object of irradiation on the basis of the reference model, the respiratory signal and the information indicating the position of the object of irradiation.COPYRIGHT: (C)2015,JPO&INPIT【課題】放射線治療のために照射対象の位置を示すモデルを生成する際、透視画像の撮像など照射対象の位置情報の取得回数を低減し、かつ、より高い精度のモデルを生成できるようにする。【解決手段】モデル生成装置が、周期的に移動する照射対象の動きの基準モデルを記憶する基準モデル記憶部と、呼吸に同期して発生する信号である呼吸信号を取得する呼吸信号取得部と、照射対象の位置を示す情報を取得する照射対象位置情報取得装置に、前記呼吸信号の位相にて示される所定のタイミングで、前記照射対象の位置を示す情報を取得させる位置情報取得制御部と、前記基準モデルと、前記呼吸信号と、前記照射対象の位置を示す情報とに基づいて、前記呼吸信号と前記照射対象の位置との関係を示す照射対象位置モデルを生成するモデル生成部と、を具備する。【選択図】図4
