Radiation imaging apparatus and radiation imaging system

摘要

A radiation imaging apparatus (100, 1800, 1900) includes a pixel array (101) having pixels including conversion elements and switching elements, a bias line for supplying a bias potential to the conversion elements (201); driving lines connected to control terminals of the switching elements (T), a driving unit (102) configured to repeat an initialization operation of supplying a driving signal to each driving line group, switching each driving signal from an OFF voltage to an ON voltage, and then returning the driving signal to the OFF voltage; an acquisition unit (120) configured to acquire a plurality of times a signal value representing a current flowing through the bias line in every driving cycle; a calculation unit (130) configured to calculate radiation information based on the signal values; and a determination unit configured to determine whether irradiation of the pixel array with radiation is present based on the radiation information.