Radiography apparatus and radiography method

A radiography apparatus that constructs images of a subject according to projection data items of the subject produced by performing a main scan in which radiation is irradiated to the subject and radiation transmitted by the subject is detected, comprising:

• a conditions-for-main scan designation device that designates the conditions for a main scan;
• a radiation tube that irradiates radiation to the subject according to the conditions for a main scan designated by the conditions-for-main scan designation device;
• and
• a detection device that has a plurality of detection elements, each of which produces projection data by detecting radiation irradiated from the radiation tube and transmitted by the subject, the plurality of detection elements being arranged in array form, wherein:
• the conditions-for-main scan designation device designates the conditions for a main scan so that a first scan of scanning the subject with a tube current of a first tube current value fed to the radiation tube, and a second scan of scanning the subject with a tube current of a second tube current value different from the first tube current value fed to the radiation tube will be successively performed;
• and
• the radiation tube irradiates radiation to the subject so that the first scan and the second scan will be successively performed under the conditions for a main scan designated by the conditions-for-main scan designation device.