Patent ID: 7194067

Claim:
A collimator, for high-energy electromagnetic radiation, comprising a plurality of X-ray optical elements which bound an opening arranged in a beam path including an X-ray optical element at an entrance side and an X-ray optical element at an exit side of the collimator, and a tube having inner walls between the X-ray optical elements at the entrance side and the exit side; wherein the X-ray optical elements are slit or hole diaphragms provided with at least one passage opening for rays; and wherein an edge zone of the X-ray optical element at the entrance side is angled at least partly relative to a direction of propagation of the rays; and the inner walls are of a different material than the diaphragms, wherein at least one of the X-ray optical elements is provided with at least one passage opening for rays, and the edge zone of the X-ray optical element which faces the passage opening is graduated and comprises a zone which is longer in the propagation direction of the rays and has a larger opening and also a subsequent zone in the direction of propagation which is shorter and has a smaller opening.