| 摘要 |
PURPOSE:To obtain radiographic image information with high picture quality by detecting dosage generated when a stimulable phospher plate receives radiant rays to adjust a reading signal condition. CONSTITUTION:The latent image of X rays radiated from an X-ray generating source 1 is formed on the stimulable phospher plate 4 in accordance with the X-ray transmissivity of an object M, but a part of the X rays is transmitted through the stimulable phospher plate 4. A detecting signal from an X-ray detector 18 is properly amplified by a sense amplifier 19 and the amplified signal is applied to a reading gain adjusting circuit 20. The adjusting circuit 20 adjusts the optical beam intensity of an optical beam generating part 5, the power supply voltage of a high voltage power supply 21 for photomultiplexer, the gain of a current/voltage converter 11 and an amplifier 12, and the dynamic range of an A/D converter 13 in accordance with the X-ray detecting signal to adjust the reading gain of the radiation image information.
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