Patent ID: 6470067
Filing Date: 2002-10-22
Classification: A61B

Abstract:
A computed tomography apparatus comprising:a scanning unit which is rotatable relative to an examination zone, about an axis of rotation extending through the examination zone; a radiation source which generates a radiation beam; a diaphragm arrangement disposed between the radiation source and the examination zone in order to form a fan beam traversing the examination zone from the radiation beam; a two-dimensional detector arrangement having a plurality of detector elements and a measuring surface, a part of which detects primary radiation from the fan beam whereas another part of the measuring surface detects scattered radiation produced in the examination zone; and a collimator arrangement interposed between the examination zone and the detector arrangement, the collimator arrangement including a plurality of lamellas disposed in planes that subdivide the fan beam into a number of segments so that the detector elements that are situated in a column extending parallel to the axis of rotation essentially are struck only by primary radiation or scattered radiation from one and the same segment.