The radiographic imaging apparatus is configured so that an irradiation device is mounted on a rotary drum of a rotary gantry. A pair of X-ray sources is disposed outside the rotary drum and attached to the outer surface of the rotary drum. A pair of FPDs facing the respective X-ray sources is mounted in the irradiation device. When X-rays are irradiated, X-ray intensity information is calculated by a signal processing device based an output signal from each radiation detection element of each FPD, and stored in a memory. Based on FOV information set by an input device, an X-ray intensity acquisition device acquires multiple pieces of X-ray intensity information that are calculated based on the output signals from the radiation detection elements in small FOV areas (or large FOV areas) of the FPDs, which are included in the X-ray intensity information stored in the memory.
