| 摘要 |
PROBLEM TO BE SOLVED: To prevent excessive radioactive exposure to a subject and an overload on an X-ray tube in automatic pulse radiography having an effect on reduction of radioactive exposure and improvement of image quality. SOLUTION: In this device, a CPU 13 is installed with software outputting an X-radiation stop command to a high-voltage generator 1 in the case that a brightness signal of a TV camera device 5 does not coincide with an output signal of a brightness adjuster 8 after a prescribed elapsed time from the start of radiography. That is, the brightness signal detected by a brightness signal detector 7 of the TV camera device 5 is inputted into an input part 9, a differential amplifier 11 compares the detected brightness signal with the output signal from the brightness adjuster 8 of a controller 10, the difference signal is inputted into the CPU 13 through an A/D converter 12, and the CPU 13 decides whether to continue the radiography or not and the voltage in the case of the continuation, according to the difference signal and an elapsed time from the start of the radiography. In the case of the decision that the prescribed time passes after the start of the radiography, the CPU 13 commands a stop of the X- radiation to the high-voltage generator 1. Thereby, excessive radioactive exposure to a subject and an overload on an X-ray tube are prevented.
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