RADIOGRAPHING SYSTEM, METHOD OF CONTROLLING AUTOMATIC EXPOSURE IN RADIOGRAPHING SYSTEM, AND RADIOLOGICAL IMAGE DETECTOR

摘要

PROBLEM TO BE SOLVED: To perform an AEC without difficulty by shooting conditions and the irradiation prohibition threshold value of abundant variation of a radiation image detector side when the variation of the shooting conditions and the irradiation prohibition threshold value set by a radiation source controller side is fewer than that of the radiation image detector side.

SOLUTION: A comparison circuit 78 of an AEC unit 67 of an electronic cassette compares the accumulated value of a detection signal from a detection pixel of the electronic cassette with an irradiation prohibition threshold value on the electronic cassette. When the accumulated value of the detection signal reaches the irradiation prohibition threshold value on the electronic cassette, a detection signal having the same voltage value as the irradiation prohibition threshold value of the radiographing condition on the source control device paired with the radiographing condition on the electronic cassette is output from a detection signal I/F 80 of the electronic cassette toward a detection signal I/F 26 of the source control device.

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