PROBLEM TO BE SOLVED: To calculate a dose with high accuracy even when an irradiation field contains a heterogeneous material.SOLUTION: An independent calculation verification device 18 includes: a specification part that specifies a homogeneous material region where a homogeneous material exists and a heterogeneous material region where a heterogeneous material exists in an irradiation field where therapeutic radiation is emitted to a patient, based on treatment planning information generated by a CT image acquired by emitting mammographic radiation to the patient and a treatment planning device 16； and a calculation part that calculates a dose when emitting the treatment radiation to the irradiation field with use of the Clarkson method, after converting the heterogeneous material region to a region equivalent to the homogeneous material region, based on the treatment planning information.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】照射野に不均質物質が含まれる場合でも精度良く線量計算をすることができる。【解決手段】独立計算検証装置１８は、患者に撮影用放射線を照射して得られたＣＴ画像及び治療計画装置１６により生成された治療計画情報に基づいて、前記患者に治療用放射線を照射する照射野のうち、均質物質が存在する均質物質領域と、不均質物質が存在する不均質物質領域と、を特定する特定部と、前記治療計画情報に基づいて、前記不均質物質領域を前記均質物質領域と等価な領域に変換した上で、クラークソン法を用いて前記照射野に前記治療用放射線を照射したときの線量を計算する計算部と、を含む。【選択図】図２
