Radiation imaging apparatus and dark current correction method therefor

A radiation imaging apparatus, for obtaining a radiation image of an object, the apparatus comprising:

• an irradiation unit;
• a radiation detection unit configured to detect radiation;
• an instruction unit configured to issue a radiation imaging start instruction;
• a setting unit configured to set an irradiation delay period between the time said instruction unit issues an imaging start instruction and the time irradiation by said irradiation unit starts;
• a first acquisition unit configured to acquire a plurality of dark current images, from said radiation detection unit, during the irradiation delay period set by said setting unit;
• a second acquisition unit configured to acquire a radiation image of the object from said radiation detection unit after the end of the irradiation delay period set by said setting unit;
• a correction data generation unit configured to generate correction data, for the radiation image acquired by said second acquisition unit, based on the plurality of dark current images acquired by said first acquisition unit;
• and
• a correction unit configured to execute dark current correction processing of the radiation image acquired by said second acquisition unit, by using the correction data generated by said correction data generation unit.