Fluoroscopy

When urinary organ contrasting inspection is performed by using a fluoroscopy for digestive organs, a region of interest such as a bladder often comes to a vicinity of a foot side end of a table top. Consequently, it is often the case that an irradiation field cannot be limited to a suitable area with respect to the region of interest and only an oblique photography can be performed. When the urinary organ contrasting inspection is performed, an X-ray tube device, an X-ray diaphragm, and an X-ray image detector are interlocked to enable a foot side end of the irradiation field to be consistent with a foot side end of the X-ray image detector. Thus, a focal point (A) of the X-ray tube device can be moved directly above the foot side end of the X-ray image detector.