Patent ID: 8218721
Filing Date: 2012-07-10
Classification: A61B,G21K

Abstract:
1. A diaphragm for manipulation of x-ray radiation that emanates from an x-ray focus of a computed tomography apparatus and that irradiates an examination subject, the x-ray focus and the diaphragm being co-rotatable around a system axis to irradiate the examination subject, said diaphragm comprising: movable diaphragm elements that define a diaphragm aperture therebetween that, in turn, defines a spatial divergence of unattenuated x-rays passing through the aperture that strike a detector; said diaphragm elements being movable to dynamically adjust said diaphragm aperture; and said diaphragm elements being comprised of a material having a transmission factor for x-ray radiation that is different from zero to permit x-rays to propagate therethrough with a degree of attenuation that is less than 100%, to produce attenuated x-rays that produce evaluable measurement signals at said detector struck by the attenuated x-rays.