Radiation imaging apparatus

A radiation imaging apparatus comprising:

• a plurality of pixels arranged to form a plurality of pixel rows and a plurality of pixel columns, the plurality of pixels including a plurality of first pixels and a plurality of second pixels whose sensitivity to radiation is lower than the plurality of first pixels;
• a plurality of signal lines arranged to correspond to the plurality of pixel columns;
• a readout circuit configured to read out a signal from the plurality of pixels via the plurality of signal lines;
• and
• a processing unit configured to decide a correction value using a plurality of signals read out from the plurality of second pixels and correct a plurality of signals read out from the plurality of first pixels using the correction value, wherein
• an internal structure of the readout circuit has a period of a power of two, and
• the pixel columns including the plurality of second pixels are arranged to have an odd period in the row direction of the plurality of pixels.