Patent ID: 8836836

Claim:
A radiation imaging apparatus comprising: an imaging unit formed by arranging a plurality of pixel circuits, wherein each of the pixel circuits has: a pixel amplifier configured to output a voltage corresponding to the electric charge generated by a photodiode; a signal sample and hold switch configured to cause a signal hold capacitor to sample and hold the electric charge corresponding to the voltage; and a switch unit configured to apply a predetermined voltage between the pixel amplifier and the photodiode; and an imaging control unit configured to control the operation of each of said plurality of pixel circuits so as to perform an imaging operation which causes the plurality of pixel circuits to output a signal corresponding to the electric charge held by the signal hold capacitor, wherein said imaging control unit causes the signal hold capacitor to sample and hold electric charge corresponding to the predetermined voltage by operating the pixel amplifier, the signal sample and hold switch, and the switch unit before the imaging operation.