Radiation imaging apparatus, driving method therefor, and radiation imaging system

A method of driving a radiation imaging apparatus that includes a plurality of pixels and generates a plurality of frame images, wherein each of the plurality of pixels includes

• a signal generation unit configured to generate a pixel signal based on charges generated and accumulated in accordance with radiation,
• a reset unit configured to cause the signal generation unit to generate an offset signal by resetting the signal generation unit to a state before the accumulation of charges, and
• a holding unit capable of holding a signal, and
• the method comprises steps of:
• controlling each pixel to generate the pixel signal and the offset signal in every frame period and hold the pixel signal and the offset signal in the holding unit;
• and
• reading out, from the holding unit, the offset signal generated in a frame period and the pixel signal generated in accordance with charges accumulated subsequently to the generation of the offset signal, and calculating a difference between the readout offset signal and pixel signal.