Patent ID: 8220993

Claim:
A radiographic apparatus comprising: a radiation output unit including a multiplicity of dispersedly-arranged radiation sources each outputting a fan beam of radiation that has a wide divergence direction and a narrow divergence direction in such a manner that cross sections of the fan beams of radiation that show the wide divergence directions are parallel to each other; a radiographic image detector that detects the fan beam of radiation output from each of the multiplicity of dispersedly-arranged radiation sources of the radiation output unit; a radiation output control unit that controls the radiation output unit in such a manner that the fan beams of radiation are output simultaneously only from each group of radiation sources, which are a part of the multiplicity of dispersedly-arranged radiation sources having irradiation ranges of the fan beams of radiation that neither overlap with each other nor are adjacent to each other on the radiographic image detector, and in such a manner that the groups of radiation sources are sequentially switched to output the radiation; an image data obtainment unit that obtains image correction data corresponding to each of the groups of radiation sources, the image correction data being sequentially detected by the radiographic image detector by sequentially outputting the fan beams of radiation to the radiographic image detector while the radiation output control unit sequentially switches the groups of radiation sources without setting a subject between the radiation output unit and the radiographic image detector; an effective area determination unit that determines, for each image correction data obtained by the image data obtainment unit, an effective area that has a value higher than a predetermined threshold value; and an image correction unit that corrects, based on the image correction data corresponding to each of the groups of radiation sources, radiographic image data corresponding to each of the groups of radiation sources that has been sequentially detected by the radiographic image detector by sequentially outputting the fan beams of radiation to the radiographic image detector while the radiation output control unit sequentially switches the groups of radiation sources in a state in which a subject is set between the radiation output unit and the radiographic image detector and that has been obtained based on the effective area.