Patent ID: 7645995

Claim:
A radiation imaging apparatus comprising: a conversion unit having a pixel region in which a plurality of pixels are arranged in a matrix, wherein the pixel includes a conversion element converting radiation into an electric charge and a switch element outputting an electric signal based on the electric charge, and a signal wiring connected to the plurality of switching elements arranged along a column and the reading out circuit unit; a capacitor element arranged outside of the pixel region; a reading-out circuit unit for reading out the electric signals from the pixels row by row, wherein the reading-out circuit unit reads out, in parallel, a signal from the capacitor element and the electric signal from the pixel, and reads out, in parallel, the signal from the capacitor element and the electric signals from the pixels of a predetermined row, and also reads out, in parallel, the signal from the capacitor element and the electric signals from the pixels of the other row different from the predetermined row, and wherein the reading out circuit unit includes a first operation amplifier arranged for each of the plurality of signal wirings, a second operation amplifier connected electrically to the capacitor element, a sampling and holding circuit unit electrically connected to the first and second operation amplifiers and a multiplexer for converting, into a serial signal, a parallel signal from the sampling and holding circuit unit; and a correction unit for correcting the electric signal based on the signal from the capacitor element, wherein the correcting unit is arranged at a stage following to, at least, the sampling and holding circuit unit.