1. an x-ray system comprising: an x-ray source; an image detector; a monitor; at least one input device configured to provide coordinates relative to an x-ray image displayed on said monitor; a controller connected with said at least one input device, said controller configured to determine at least one Region of Interest (ROI) on said displayed image based on coordinates provided by said at least one input device; an image processing unit connected with said detector, said monitor and said controller, said image processing unit configured to process the detected image displayed on said monitor by modifying image parts outside said at least one region of interest (ROI) according to the image part in said at least one region of interest.