A radiation imaging system comprising a radiation imaging apparatus and an imaging control apparatus, the radiation imaging apparatus including a dose detection pixel that detects a dose of radiation irradiated from a radiation source, and the imaging control apparatus controlling the radiation imaging apparatus, wherein before radiation imaging, the imaging control apparatus:
- specifies a position of the dose detection pixel in a region of interest for calculating a dose indicator value of a radiation image, determines a threshold according to the position of the dose detection pixel, and transmits the position of the dose detection pixel and the threshold to the radiation imaging apparatus, and
- the radiation imaging apparatus:
- makes a setting of the position of the dose detection pixel in the region of interest and the threshold transmitted from the imaging control apparatus, and performs imaging based on the setting.