Patent ID: 7822179

Claim:
An apparatus for processing a radiation image, comprising: a radiation detector including a plurality of detecting elements for detecting applied radiation as charge information and storing the charge information into a storage capacitor; a driving circuit which controls a switch included in each of the detecting elements to be in an ON state and allows the charge information stored in the storage capacitor to be read out, or to be in an OFF state to prevent the charge information stored in the storage capacitor from being read out; a reading circuit for reading the charge information from the storage capacitor, while the driving circuit controls the switch to remain in the ON state; and a correcting circuit for correcting the charge information by subtracting leak charge information from ON control charge information of each of the detecting elements read out by the reading circuit, wherein the leak charge information is charge information of each of the detecting elements at a time the ON control charge information is read out, the leak charge information being obtained by using OFF control charge information of each of the detecting elements that is read out by the reading circuit and that processed with a smoothing operation among detecting elements, while the driving circuit controls all of the switches to remain in the OFF state.