Patent ID: 8760544

Claim:
A light or radiation image pickup apparatus comprising: a conversion layer for converting light or radiation into charge signals; detecting elements corresponding to respective capacitors for accumulating the charge signals, the conversion layer being divided into a two-dimensional matrix form corresponding to the detecting elements; a reading device for reading the charge signals accumulated in the capacitors; a charge-to-voltage converting device for converting the charge signals read from the reading device into voltage signals; a temperature measuring device for measuring temperatures of the conversion layer; a dark current noise calculating unit for calculating dark current noises generating from dark current flowing through the conversion layer, from a dark current noise temperature characteristic obtained beforehand at times of dark images by varying time for accumulating the charge signals in the capacitors, and the temperatures measured by the temperature measuring device; a dark image signal removing unit for removing dark image signals from the voltage signals; a noise variation calculating unit for calculating a variation between a dark current noise at a temperature at a time of dark image signal acquisition and a dark current noise at a temperature at a time of image pickup, calculated by the dark current noise calculating unit; and a noise variation removing unit for removing the dark current noise variation calculated by the noise variation calculating unit from the voltage signals.