Patent ID: 8503607

Claim:
A control apparatus for controlling an X-ray irradiation unit comprising a generation unit which generates X-rays and a collimator which includes a stop to define a beam spread angle of the generated X-rays, wherein the X-ray irradiation unit is configured to irradiate an object with X-rays at an arbitrary position and an arbitrary angle, said control apparatus comprising: a first calculation unit configured to calculate a first irradiation field by using a positional relationship between the generation unit and an imaging unit including an image detection unit which generates an X-ray image by detecting X-rays transmitted through the object; a second calculation unit configured to calculate a second irradiation field formed on the imaging unit based on a dose of X-rays generated by the imaging unit; and a control unit configured to control an irradiated region irradiated by the X-ray irradiation unit based on a third irradiation field decided by combining the first irradiation field and the second irradiation field.