PROBLEM TO BE SOLVED: To carry out a stable AEC (Automatic Exposure Control) which is not affected by geometric positioning misalignment of a grid and a dose detection sensor with small concern for image quality declines and without involving time and trouble.SOLUTION: A plurality of pixels 45 which receive an X-ray and accumulate electric charges, and a plurality of detection pixels 65 which detect an X-ray dose, are disposed upon an image capture face 36 in a detection panel 35a. The plurality of detection pixels 65 are disposed periodically at intervals. In a location facing the image capture face 36, a grid 18 in which X-ray absorption units 33 and X-ray transmission units 32 are alternately and periodically arrayed in a first direction is disposed. Since a positioning period S1 in the first direction of the detection pixels 65 is different from a fluctuation period 1/FSG of a grid detection signal SG obtained when the grid 18 is photographed by the detection panel 35a, the output values of each detection pixel 65 are scattered, and a fluctuation range of an average value of the output values is suppressed.COPYRIGHT: (C)2014,JPO&INPIT【課題】画質低下の懸念が少なく、かつ、手間を掛けずに、グリッドと線量検出センサの幾何学的配置のずれの影響を受けない安定したAECを行う。【解決手段】検出パネル35aには、X線を受けて電荷を蓄積する複数の画素45と、X線の線量を検出する複数の検出画素65とが撮像面36に設けられている。複数の検出画素65は、間隔を空けて周期的に配置されている。撮像面36と対面する位置には、X線吸収部33とX線透過部32とが第1の方向に交互に周期的に配列されたグリッド18が配置されている。検出画素65の第1の方向の配置周期S1は、検出パネル35aによってグリッド18を撮影した場合に得られるグリッド検出信号SGの変動周期1/FSGと異なっているため、各検出画素65の出力値が分散され、出力値の平均値の変動幅が抑えられる。【選択図】図8
