Patent ID: 7742570

Claim:
An X-ray radiographic apparatus comprising: an X-ray generation unit including an X-ray source, the X-ray source including an X-ray tube and an X-ray movable diaphragm that adjusts a field of view of an X-ray provided from the X-ray tube, and a lifting and lowering device that moves the X-ray source at least in a vertical direction; an X-ray imaging unit including an X-ray flat panel detector that converts an incoming X-ray into electrical signals, and an upright stand that moves the X-ray flat panel detector in the vertical direction; a screen provided at a predetermined position ahead of the X-ray imaging unit, the screen supporting a subject to prevent the subject from moving, the screen being provided with a marker for alignment between a plurality of X-ray images taken during long length imaging; a fixed overlapping area setting device that sets an area of the X-ray flat panel detector on which the marker may be projected as a fixed overlapping area, according to a moveable range of the X-ray source during long length imaging; an imaging area setting device that sets an imaging area for the long length imaging; a field-of-view area determination device that determines a plurality of field-of-view areas when dividing the set imaging area into a plurality of areas and taking images, the field-of-view area determination device determining each of the field-of-view areas so that adjacent field-of-view areas overlap each other at the determined fixed overlapping area; a position determination device that determines a position to which the X-ray flat panel detector is moved for each of the field-of-view areas determined by the field-of-view area determination device so that an X-ray is applied to the field-of-view area; an upright stand control device that controls the upright stand so that the X-ray flat panel detector is sequentially moved to one of the positions determined by the position determination device for each exposure during the long length imaging; and an X-ray control device that controls the X-ray generation unit according to one of the field-of-view areas determined by the field-of-view area determination device for each exposure during the long length imaging so that an X-ray is applied only to the field-of-view area.