Title: Means for generating an X-ray exposure command in response to a video signal component

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Abstract: An X-ray apparatus for diagnosis which utilizes an X-ray television device includes a video circuit for setting a particular area of an X-ray image, a video gate circuit for selecting a corresponding signal component from a video signal representative of the X-ray image, a command pulse generator adapted to detect a variation in level of the video signal as caused by a contrast medium and generate an X-ray exposure command pulse when the signal level exceeds a threshold level, and a pulse shaping circuit for generating timing pulses for these circuits. The particular area of the X-ray image is set by the operator while observing the X-ray image on the TV monitor. When a patient drinks the contrast medium of barium and at the same time an operator depresses a start switch for photographing the apparatus detects the variation in level of the video signal as caused by barium to permit the X-ray exposure command signal to be issued for photographing so that the predetermined area of the X-ray image can be automatically photographed.


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