An object of the present invention is to solve the problem of interference between a fluoroscopic device and other structures such as an irradiation field forming device and the problem of space as compared with the prior art. A plurality of X-ray fluoroscopic apparatuses whose positions are fixed at the time of acquisition of a fluoroscopic image and a bed 33 configured to be capable of changing the tilt angle, while changing the tilt angle of the bed 33 in sequence. A plurality of X-ray fluoroscopic images are acquired by a plurality of X-ray fluoroscopic devices for every 33 inclination angles. A CT image is reconstructed from the acquired plurality of fluoroscopic images, the movement direction and movement amount of the bed 33 are calculated so as to coincide with the reference CT image, and the bed 33 is moved based on the movement direction and movement amount. Let [Selection] Figure 2【課題】透視装置と照射野形成装置などの他の構造物との干渉の問題やスペースの問題を従来に比べて解決する。【解決手段】透視画像の取得時は位置が固定される複数のＸ線透視装置と、傾斜角度を変更可能に構成されたベッド３３を用いて、ベッド３３の傾斜角度を順次変更しながら、ベッド３３の傾斜角度毎に複数のＸ線透視装置により複数のＸ線透視画像を取得する。これら取得した複数のＸ線透視画像からＣＴ画像を再構成し、基準ＣＴ画像と一致するようにベッド３３の移動方向と移動量を算出し、その移動方向と移動量に基づいてベッド３３を移動させる。【選択図】 図２
