Patent ID: 7532706

Claim:
An imaging apparatus comprising: an imaging unit having a plurality of conversion elements, said imaging unit being configured to obtain an image signal according to a radiation dose transmitted through an object; and a gain correction unit which corrects, in order to correct gain characteristics of the plurality of conversion elements, an image signal from said imaging unit using a correction signal stored on a storage medium, the gain characteristics being input/output characteristics of each of the plurality of conversion elements, the input/output characteristics being a relation between the number of photons or radiation dose incident on each of the plurality of conversion elements and charge amount or output signal amount generated in each of the plurality of conversion elements according to the number of photons or radiation dose, the correction signal being a signal obtained from said imaging unit by a radiation irradiation on said imaging unit without an object between a radiation generating device and said imaging unit, wherein said gain correction unit is arranged to select a correction signal corresponding to a radiographic mode from a plurality of correction signals corresponding to a plurality of radiographic modes between which a radiation dose to said imaging unit in order to obtain the image signal for one image differs, and correct the image signal in the radiographic mode by performing division for the image signal and the selected correction signal.