PROBLEM TO BE SOLVED: To speedily perform processing based on output of a radiation dose detecting sensor.SOLUTION: An FPD 35 includes a pixel 36 for image detection and a detection pixel 65 for radiation dose detection. A signal processing circuit 43 is a pipeline type which is provided with first and second buffer memories 54a and 54b at a post stage of an A/D converter 53. During radiation dose detecting operation, the signal processing circuit 43 performs, in a first cycle, inputting of a radiation dose detecting signal Sd based on electrical charge s from the detection pixel 65, into the first buffer memory 54a, and outputting of a dummy signal Dd from the second buffer memory 54b, in parallel. In a second cycle shorter than the first cycle, the outputting of the radiation dose detecting signal Sd from the first buffer memory 54a, and the inputting of the dummy signal Dd into the second buffer memory 54b are performed in parallel. The first cycle and the second cycle are alternately repeated, and an irradiation start of X-radiation is detected with an irradiation start detector 61 by use of the radiation dose detecting signal Sd.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2016,JPO&INPIT【課題】素早く線量検出センサの出力に基づく処理を行う。【解決手段】FPD35は画像検出用の画素36と線量検出用の検出画素65とを有する。信号処理回路43はA/D変換器53の後段に第1及び第2バッファメモリ54a、54bが設けられたパイプライン型である。線量検出動作時、信号処理回路43は、第1サイクルで、検出画素65からの電荷sに基づく線量検出信号Sdの第1バッファメモリ54aへの入力と、第2バッファメモリ54bからのダミー信号Ddの出力を並行して行う。第1サイクルより短い第2サイクルで、線量検出信号Sdの第1バッファメモリ54aからの出力とダミー信号Ddの第2バッファメモリ54bへの入力を並行して行う。第1サイクルと第2サイクルが交互に繰り返され、線量検出信号Sdにより照射開始検出部61でX線の照射開始が検出される。【選択図】図4
