| 摘要 |
<p>The invention relates to an X-ray imaging system, comprising an X-ray source (2) for emitting an X-ray beam, a power supply unit (14) which is connected to the X-ray source, an X-ray detector (8) for converting the X-ray beam into an optical image, a television pick-up device (10) for converting the optical image into a video signal, a detection device (12) which is connected to the television pick-up device and which serves to form a control signal from the video signal, an output of the detection device being connected to the power supply unit for adjustment thereof, and a display unit which is connected to the output of the television pick-up device via an amplifier (18). When the reciprocal of the signal generated by the detection device is used as the gain factor for the amplifier, a stable brightness is obtained on the television monitor without giving rise to a light flash when the X-ray source is switched on. As a result, the duration of exposure can be reduced during medical imaging so that the dose applied is less and motional unsharpness is reduced. <IMAGE></p> |
