1. An X-ray imaging system, comprising: a moveable X-ray source and a moveable X-ray detector; a plurality of object-surface detecting sensors; a positioning detection arrangement; a processing unit; and a display unit; wherein the sensors are arranged such to detect object data of objects located between the X-ray source and the X-ray detector; wherein the positioning detection arrangement is provided to detect the current position of the X-ray source and the X-ray detector and the position of the sensors; wherein the processing unit is configured to compute a situation-map of the current spatial situation of a positional arrangement exclusively between the X-ray source and the X-ray detector based on the object data provided by the sensors and the current position, the situation-map distinguishing at least between empty spaces and spaces occupied by rigid objects; and wherein the situation-map comprises a representation of the X-ray source and the X-ray detector in relation to the positioning detection arrangement; wherein the display unit is configured to display the situation-map to a user operating the X-ray imaging system; wherein the X-ray imaging system is a C-arm imaging system comprising a C-arm structure, wherein the X-ray source and the X-ray detector are mounted to opposing ends of a C-arm; wherein the sensors are mounted to the C-arm structure in a distributed manner along an inner side of the arc; and wherein the positioning detection arrangement comprises angulation detectors for providing information about the movement of the C-arm.