Patent Number: 053496256
Section: claims

1. An x-ray diagnostics installation for peripheral angiography comprising: an x-ray exposure means for generating an x-ray beam and for detecting said x-ray beam after passage through a patient to obtain an x-ray exposure of said subject, said x-ray exposure unit including diaphragm means for selectively gating said x-ray beam;  a support unit for receiving a patient to be examined using said x-ray exposure means, said support unit and said x-ray exposure means being relatively movable through a plurality of steps each having a step length with an exposure of said patient being obtained by said x-ray exposure means at each of said steps to obtain a plurality of successive exposures; and  control means connected to said x-ray exposure means and to said support unit for controlling operation of said x-ray exposure means and said support unit, including controlling said diaphragm means, said control means including arithmetic means for calculating values for pre-setting one or more of said plurality of successive exposures, said step length and said plurality of steps matched to said patient based on subject-related data including the size, weight and physique of said patient. 2. An x-ray diagnostics installation as claimed in claim 1 wherein said x-ray exposure means includes an x-ray radiator having a focus, and a radiation receiver, and wherein said arithmetic means comprises means for employing a focus-to-patient distance and a focus-to-radiation receiver distance in calculating said values for pre-setting by said control means in combination with said subject-related data. 3. An x-ray diagnostics installation as claimed in claim 1 wherein said control means includes display means for displaying a contour of said patient in a patient plane, a setting of said diaphragm means and a setting of the radiation field of said x-ray exposure unit with reference to said patient for each exposure position in said plurality of successive exposures. 4. An x-ray diagnostics installation as claimed in claim 3 wherein said display means is a video monitor. 5. An x-ray diagnostics installation as claimed in claim 3 wherein said display means is a printer. 6. An x-ray diagnostics installation as claimed in claim 3 wherein said control means includes an operating unit and wherein said display means is a display field of said operating unit. 7. An x-ray diagnostics installation as claimed in claim 1 wherein said installation has system-related distance parameters, and wherein said control means includes a memory, connected to said arithmetic means, in which said distance parameters, said step length, said plurality of steps, and standard settings for said diaphragm means are stored for use by said arithmetic means. 8. An x-ray diagnostics installation as claimed in claim 1 further comprising video chain means for generating and processing a digital image of said patient, for obtaining and supplying said patient-related data to said arithmetic means. 9. An x-ray diagnostics installation as claimed in claim 1 wherein said exposures in said plurality of exposures have an overlap and said installation further comprising means for supplying data corresponding to a selected overlap to said arithmetic means for use in calculating said values for pre-setting by said control means. 10. An x-ray diagnostics installation as claimed in claim 1 wherein said exposures in said plurality of exposures have a section with said installation further comprising means for supplying data corresponding to a selected section with said arithmetic means for use in calculating said values for pre-setting by said control means. 11. An x-ray diagnostics installation as claimed in claim 1 further comprising memory means for storing data for a specified patient and pre-settings associated with said specified patient for re-use in subsequent examinations of said specified patient. 12. An x-ray diagnostics installation as claimed in claim 1 wherein said x-ray exposure means and said patient support define an examination region, and further comprising means for supplying data corresponding to a selected examination region to said arithmetic means for use in calculating said values for pre-setting by said control means.