US Patent 10070082 Radiation imaging apparatus and method of controlling radiation imaging apparatus

A radiation imaging apparatus that has a plurality of pixels capable of outputting an image signal in accordance with an irradiation of radiation comprises a photoelectric conversion unit which has a first capacitance and a second capacitance as charge accumulation capacitances and a gain correction unit configured to correct a pixel value in relation to a dose of the irradiated radiation based on an image signal outputted in accordance with a charge accumulated by the photoelectric conversion unit. The gain correction unit changes an interval of gain correction points at which to perform correction in accordance with a switch from a first capacitance to a second capacitance.