Patent ID: 6305842
Filing Date: 2001-10-23
Classification: A61B,G03B

Abstract:
An X-ray examination apparatus comprising:an X-ray source anda diaphragm unit connected to the X-ray source,the diaphragm unit further comprising shutters for limiting a radiation cone beam emanating from a focal spot of the X-ray source, and a light source for generating a light cone beam which traverses the shutters via a reflector device,wherein the shutters include correction shutters which are transparent to X-rays but impervious to light and limit the light cone beam and two preferably adjustable pairs of shutter plates having pair-wise parallel shutter edges for limiting the radiation cone beam in two mutually perpendicular directions, wherein one of the correction shutters is connected to each shutter plate in such a manner that its edge extends parallel to the shutter edge and wherein the correction shutters connected to a pair of shutter plates are situated in mutually offset planes.