Patent ID: 8218728
Filing Date: 2012-07-10
Classification: A61B,G21K

Abstract:
1. A computed tomography scanner for performing a spiral scan, comprising: a rotatable X-ray emitter for generating a beam fan; an X-ray detector, positioned diametrically opposite to said rotatable X-ray emitter; an evaluation unit; and an X-ray filter, arranged downstream of the rotatable X-ray emitter, a position of the X-ray filter being correlated to a position of the X-ray detector and said X-ray filter being partly inserted into the beam fan only during operation for generating an unfiltered radiation component and, simultaneously, a filtered radiation component of the beam fan, wherein the radiation components have different X-ray spectra and wherein the evaluation unit is designed for separate evaluation of a measurement signal of the unfiltered radiation component and a measurement signal of the filtered radiation component, to obtain dual-energy images, wherein the X-ray filter is displaceably arranged in the beam fan and the X-ray filter is arranged in rotatable fashion.