contrast medium if it has been achieved a contrast image is recorded with the first modality and the mask image and the contrast image are processed and analyzed application_number US 50781809 A description fig1 shows an x ray diagnostic device for generating c arm ct recordings said device having a c arm 2 mounted rotatably on a stand in the form of an industrial robot 1 with said c arm having an x ray radiation source for example an x ray emitter 3 and an x ray image detector 4 arranged at its ends the x ray image detector 4 can be a rectangular or square flat semiconductor detector that is preferably made of amorphous silicon a si a patient 6 to be examined is positioned on a patient positioning couch 5 in the path of the radiation beam of the x ray emitter 3 for the recording of a heart for example a system control unit 7 with an imaging system 8 is connected to the x ray diagnostic device said imaging system 8 receiving and processing the image signals of the x ray image detector 4 the x ray images can then be viewed on a monitor 9 by means of the industrial robot 1 known for example from de 10 2005 012 700 a1 which preferably has six axes of rotation and thus six degrees of freedom the c arm 2 can be displaced spatially as required being rotated for example about a center of rotation between the x ray emitter 3 and including the x ray detector 4 the x ray system 1 to 4 according to the invention is rotatable in particular about centers of rotation and axes of rotation at the plane of the x ray image detector 4 preferably.