X-Ray diagnostic system for angiographic x-ray photographic series

Claim 1

An x-ray diagnostic system for the preparation of angiographic x-ray photographic series over an entire area to be detected corresponding to the course of a contrast medium in a vessel system, said x-ray diagnostic system comprising a patient support (1), an x-ray tube (3) having a diaphragm installation (7) including diaphragm plates for the limitation of the x-ray beam irradiating the patient, and a cassette changer for x-ray film cassettes, characterized in that the cassette changer (4) is a cassette changer having film support means of a total longitudinal extent corresponding to the entire area to be detected, and that the diaphragm installation (7) comprises a fixed diaphragm (8) which limits the maximum size of the x-ray beam (6) to a beam configuration covering said entire area to be detected and covering said total longitudinal extent of said cassette changer while the x-ray tube is in a fixed position, individually adjustable diaphragm plates (9, 10) disposed on opposed sides of said x-ray beam for defining therebetween a resultant x-ray beam for irradiating the patient, and means (11, 12) for effecting the individual, independent adjustment of said diaphragm plates (9, 10) for selectively setting the dimension of the resultant x-ray beam in the longitudinal direction of the patient support and for directing the resultant x-ray beam toward selective respective segments of said total longitudinal extent of said cassette changer which segments lie in respective different directions from the x-ray tube requiring corresponding changes in the longitudinal axes of the respective resultant x-ray beams while said x-ray tube remains in said fixed position.