A tomographic imaging system comprising: - a support carrying a tomographic image-data acquisition system and defining a reference coordinate frame, - a scan plan control configured to set the tomographic image-data acquisition system to acquire tomographic image-data from a selected imaging zone in the reference coordinate frame, - a motion detection system configured to detect movement and including: - a dynamic camera system configured to receive dynamic image information registered in the image coordinate frame of the dynamic camera system, - an arithmetic unit configured to transform the selected imaging zone from the reference coordinate frame to the image-coordinate-frame, - a motion analyser configured to derive motion information from the registered dynamic image information in the transformed selected imaging zone; wherein the motion detection system has access to a volumetric outline, from survey scan-data or from the dynamic camera system, including the selected imaging zone in the reference coordinate-frame; - a region-analyser configured to determine within the selected imaging zone in the reference coordinate-frame a zone of interest of the volumetric outline within the selected imaging zone, wherein the arithmetic unit is configured to transform the zone-of-interest from the reference coordinate frame onto the image coordinate-frame of the dynamic camera system, thus determining a transformed zone of interest and, - a camera control configured to set the acquisition of the dynamic camera system to acquire dynamic image information from at least the determined transformed zone of interest and wherein the motion-analyser is configured to predominantly derive motion from the dynamic image information from the transformed zone of interest. - a support carrying a tomographic image-data acquisition system and defining a reference coordinate frame, - a scan plan control configured to set the tomographic image-data acquisition system to acquire tomographic image-data from a selected imaging zone in the reference coordinate frame, - a motion detection system configured to detect movement and including: - a dynamic camera system configured to receive dynamic image information registered in the image coordinate frame of the dynamic camera system, - an arithmetic unit configured to transform the selected imaging zone from the reference coordinate frame to the image-coordinate-frame, - a motion analyser configured to derive motion information from the registered dynamic image information in the transformed selected imaging zone; wherein the motion detection system has access to a volumetric outline, from survey scan-data or from the dynamic camera system, including the selected imaging zone in the reference coordinate-frame; - a region-analyser configured to determine within the selected imaging zone in the reference coordinate-frame a zone of interest of the volumetric outline within the selected imaging zone, wherein the arithmetic unit is configured to transform the zone-of-interest from the reference coordinate frame onto the image coordinate-frame of the dynamic camera system, thus determining a transformed zone of interest and, - a camera control configured to set the acquisition of the dynamic camera system to acquire dynamic image information from at least the determined transformed zone of interest and <EOS>