Radiation image capturing apparatus

A radiation image capturing apparatus comprising:

• a plurality of scan lines;
• a plurality of signal lines;
• a plurality of radiation detection elements arranged on a board to be distributed two-dimensionally, the radiation detection elements generating respective electric charges by receiving radiation and thereby being irradiated;
• a plurality of bias lines to apply reverse bias voltage to the radiation detection elements;
• a readout IC which reads respective image data based on the respective electric charges generated by the radiation detection elements, whereby an image data readout process is performed;
• a control unit which controls at least the readout IC;
• and
• a noise detection unit which, at time when each of the image data is read, outputs data based on at least one of (i) voltage noise generated in the reverse bias voltage applied to the radiation detection elements via the bias lines and (ii) voltage noise generated in off voltage applied to the scan lines, wherein
• the control unit:
• estimates an offset component contained in the data output by the noise detection unit;
• calculates noise data based on the data output by the noise detection unit and the estimated offset component;
• and
• subtracts the calculated noise data from the image data read by the readout IC, thereby generating corrected image data.