X-Ray diagnostic system for radiographs

摘要

In an exemplary embodiment, an X-ray image intensifier and a camera for photographing the X-ray image intensifier-output image, an automatic exposure timer which includes an integrator for detection of the light quantity per image and a threshold value switch for shut off of the X-ray tube upon attainment of a setpoint light quantity. The threshold value switch possesses a control input for determining the switch-off threshold which is connected to a correction circuit for comparing the actual value and the setpoint value of the light quantity and which so determines the threshold that the actual value is adapted to the setpoint value. The afterglow of the X-ray image intensifier following the occurrence of a switch-off signal is thereby compensated.