X-ray diagnostics installation with spatial frequency high-pass filtering

摘要

An X-ray diagnostics installation with spatial frequency high- pass filtering has an X-ray tube, in image intensifier video chain, first and second image memories, and a difference stage for subtracting images in the memories and thereby forming a difference signal between first video signals and chronologically succeeding second video signals. The resulting image is displayed on a monitor. The installation further has a control unit for controlling the size of the tube focus. A video signal for an X-ray exposure produced using a first size of the tube focus is entered into one of the memories, and this signal is subtracted in the difference stage from a video signal for an X-ray exposure produced with a second size of the tube focus.