Patent ID: 7440536
Filing Date: 2008-10-21
Classification: A61B,G03B

Abstract:
1. A method for scattered radiation correction of a CT system including at least two simultaneously operated focus/detector systems, arranged angularly offset from one another on a rotatable gantry, the method comprising: scanning an object by rotating the focus/detector systems, arranged angularly offset from one another, about a system axis of the CT system; determining absorption values for a multiplicity of individual rays from a measured ratio of measured radiation intensity from the scanning to unattenuated radiation intensity; subjecting the determined absorption values values to a scattered radiation correction; reconstructing at least one of CT pictures and CT volume data of the object using the determined absorption values, wherein, using at least one phantom, similar to the examined object at least in a subregion, for at least one of the focus/detector systems, a scattered radiation intensity occurring is determined in a detector of one of the at least two focus/detector systems during the operation of at least one focus of at least one other focus/detector system, and a spatial distribution thereof is stored for a number of angles of rotation of the focus/detector systems, wherein during scanning of the object, the scattered radiation intensities determined with the aid of a similar phantom that originate from the at least one other focus/detector system are subtracted from the measured intensities of the at least one of the focus/detector systems system while taking account of a spatial orientation of the focus/detector systems and a beam respectively considered, and wherein the absorption values are calculated with the aid of the intensity values thus corrected, and at least one of the CT pictures and the CT volume data are thereby reconstructed.