Patent ID: 7718973

Claim:
A radiation imaging apparatus comprising: a plurality of pixels arranged two-dimensionally, each pixel including a radiation detecting element converting incident radiation into electric charge; a control unit for performing a state control to switch the radiation detecting element in a predetermined at least one pixel of the plurality of pixels into a senseless state and make the radiation detecting element in a second pixel of the plurality of pixels assume a sensible state, wherein an electric charge generated according to incident radiation cannot be taken out of the radiation detecting element in said senseless state in the predetermined pixel and an electric charge generated according to incident radiation can be taken out of the radiation detecting element in said sensible state, and to make the radiation detecting element in the other pixel sensible state wherein an electric charge generated according to incident radiation can be taken out of the radiation detecting element in the other pixel, wherein the control unit can control to make the radiation detecting element in the predetermined pixel sensible state; a signal processing unit including a reading circuit for reading out in parallel a first electric signal based on the pixel that is in the sensible state and a second electric signal from not based on the charge according to the pixel that is in the senseless state, wherein the second electric signal is not based on electric charge generated by incident radiation; and said signal processing unit further configured to perform a subtraction, in which the second electrical signal is subtracted from the first electric signal.