Patent Number: 048037168
Section: claims

1. An x-ray diagnostics installation comprising: means for generating an x-ray beam having a central ray directed at an examination subject;  x-ray film disposed in the path of said x-ray beam after said examination subject for recording radiation from said means for generating attenuated by said examination subject;  means disposed between said examination subject and said x-ray film for generating an electrical signal corresponding to the exposure time;  a secondary radiation grid also disposed between said examination subject and said x-ray film having lamellae;  means for moving said secondary radiation grid perpendicularly with respect to said central ray of said x-ray beam; and  control means for controlling the speed of movement of said secondary radiation grid dependent on said exposure time including means for integrating said signal corresponding to the exposure time, and wherein said signal corresponding to said exposure time is also supplied as a control signal for said means for moving said secondary radiation grid, such that the speed of said secondary radiation grid is controlled for all exposure times to avoid imaging said lamellae of said secondary grid on said x-ray film.