Patent ID: 6925141
Filing Date: 2005-08-02
Classification: A61B,G01N,Y10S

Abstract:
1. A method for generating CT images of a periodically moving examination area, comprising: moving at least one focus, in order to scan a periodically movable object to be examined with a beam of rays coming from the at least one focus and with a two-dimensionally designed detector array with a multiplicity of distributed detector elements for detecting the rays of the beam of rays, relative to the object to be examined on at least one focal track circumscribing the object to be examined with the detector array lying opposite, wherein the detector elements of the detector array are adapted to deliver output data representing an attenuation of the rays when passed through the periodically movable object; simultaneously collecting movement data upon movement of the movable object, to enable assigning of detector data and data resulting therefrom to movement states; filtering the output data; three-dimensionally back-projecting the filtered output data to generate at least one sectional image of a layer of the object to be examined having a layer thickness, wherein each sectional image represents absorption values, obtained from the output data, of the voxel belonging to the layer of the object to be examined for the radiation of the beam of rays, wherein a weighting function, for weighting the spatial distance of a ray in question from the voxel in question, is used for the back-projecting, and wherein a weighting function, representing a time difference from the examination area movement state to be represented is also used for the back-projecting.