| 摘要 |
PURPOSE:To achieve proper film blackening degree continuously by selecting the detecting position freely thereby detecting the really required X-ray transmission amount at the photographying position. CONSTITUTION:When providing a picture element board 14 on the screen of a TV monitor 8, an indication picture can be recognized through the picture element board 14. When depressing the key switch of a number corresponding to the diagnosis position described on the picture element board 14, the electronic switch at the corresponding position in the electronic switch group 17 is conducted, and the signal from corresponding photo-diode in a photo-detector group 16 is inputted to an adder amplifier 19. The output from said amplifier 19 will control a photographying timer 12 the output of which will block X-ray from an X-ray tube 1. |
