| 摘要 |
<p>An X-ray examination apparatus is arranged to convert an X-ray image of an object into an optical image, and to derive an image signal from the optical image by means of an image pick-up apparatus. The image pick-up apparatus includes a controllable amplifier. The X-ray examination apparatus includes an exposure control system with a photosensor for measuring the brightness of the optical image. The exposure control system adjusts the controllable amplifier on the basis of the photosensor signal, representing the brightness of the optical image, and a correction number. The correction number is derived from the image signal.</p> |
