PROBLEM TO BE SOLVED: To perform a treatment of a region to be treated accurately and precisely by correcting treatment plan information in consideration of an amount of deviation from a CT image incorporated in the treatment plan information, of an XVI image immediately before the treatment in a radiotherapy system.SOLUTION: A radiotherapy system includes: a bed 31 on which a subject to be examined is placed and which is configured so that a treatment region of the subject to be examined can be moved to a first imaging position and to a second imaging position a radiotherapy device 50 for controlling a rotation part 55 and a diaphragm 58, and emitting radiation for the treatment an imaging device for controlling an X-ray tube 51 for emitting an X-ray for imaging, and an X-ray detector 53 for detecting the X-ray from the X-ray tube 51, and imaging at the first imaging position an X-ray CT device 20 for controlling an X-ray tube 21 for emitting an X-ray for imaging, and an X-ray detector 23 for detecting the X-ray from the X-ray tube 21, and imaging at the second imaging position and control means for controlling the radiotherapy device 50 using the imaging device and the X-ray CT device 20.COPYRIGHT: (C)2014,JPO&INPIT【課題】放射線治療システムにおいて、治療直前のXVI画像の、治療計画情報に含まれるCT画像からのずれ量を考慮して治療計画情報を補正することで、治療部位の治療を正確に精度よく実施すること。【解決手段】被検体を載置し、第1の撮像位置と第2の撮像位置に被検体の治療部位を移動可能に構成された寝台31と、回転部55及び絞り58を制御して、治療用の放射線を照射する放射線治療装置50と、撮像用のX線を照射するX線管51と、X線管51からのX線を検出するX線検出器53とを制御して、第1の撮像位置で撮像を行なう撮像装置と、撮像用のX線を照射するX線管21と、X線管21からのX線を検出するX線検出器23とを制御して、第2の撮像位置で撮像を行なうX線CT装置20と、撮像装置及びX線CT装置20の出力を用いて、放射線治療装置50を制御する制御手段と、を有する。【選択図】 図2
