The present invention provides a dose distribution measuring apparatus comprising: at least two cameras (7, 8) disposed on a plane perpendicular to an irradiation center axis (CA) of a water phantom (3) and a particle beam (4), so as to shoot images of the luminescence in a liquid (5) containing fluorescent materials of the water phantom and a dose distribution calculation evaluation device (10), which comprises a spot position calculation unit (12) for calculating spot positions of the irradiation positions at the particle beam stop by a camera image data shot by the camera and a dose adding unit (13) for calculating irradiation dose distribution in the spot position calculated by the spot position calculation unit (12) by using the data of the PDD and OCR stored in a pencil beam dose distribution data storage unit (16), so that the radiation dose distributions of each spot position are added together.本發明提供一種線量分布測定裝置,係具備:至少2台攝像機(7、8),以對水假體中之包含螢光物資之液體(5)之發光進行攝像之方式配置在水假體(3)之與粒子線(4)之照射中心軸(CA)垂直的面上;以及線量分布算出評估裝置(10),其具備:點位置算定部(12),由以攝像機所攝像之攝像機影像資料算定屬於粒子線之停留時之照射位置的點位置;及線量加算部(13),利用儲存在窄射束線量分布資料記憶部(16)之PDD及OCR的資料,來算定由點位置算定部(12)所算定之點位置中的照射線量分布,以加算每個點位置之照射線量分布。1‧‧‧線量分布測定裝置2‧‧‧照射系統3‧‧‧水假體4‧‧‧粒子線5‧‧‧包含螢光物質之液體6‧‧‧射入窗7、8‧‧‧攝像機10‧‧‧線量分布算出評估裝置11‧‧‧攝像機影像處理部12‧‧‧點位置算定部13‧‧‧線量加算部14‧‧‧線量分布評估部15‧‧‧照射區域線量分布資料記憶部16‧‧‧窄射束線量分布資料記憶部17‧‧‧攝像機校正用參數記憶部20‧‧‧治療計劃裝置21‧‧‧照射系統控制器22‧‧‧加速器系統控制器
