Radiation imaging apparatus, radiation imaging system, control method for radiation imaging apparatus, and non-transitory computer- readable storage medium

A radiation imaging apparatus comprising an imaging unit configured to generate a radiation image, a detector configured to detect radiation to monitor an incident dose, a processor including an amplifier and configured to perform processing of reading out signals from the imaging unit and the detector and outputting a signal based on the readout signals, and a controller configured to control the processor is provided. The controller causes the processor to operate in a first power consumption mode before radiation irradiation and perform a reset operation, and causes the processor to operate in a second power consumption mode with higher power consumption than the first power consumption mode in accordance with information indicating a start of radiation irradiation, and causes the processor to start outputting a signal for monitoring an incident dose based on a signal read out from the detector.