Patent ID: 7636415

Claim:
A method for producing tomographic pictures with the aid of an X-ray computed tomography system including at least two X-ray sources, arranged with an angular offset on a gantry to revolve around and scan an examination object in a fashion rotating about a system axis, each of the at least two X-ray sources together with at least one of respective detector elements and a respective co-rotating detector constituting a focus/detector system, the method comprising: determining absorption of emitted X-radiation through the examination object, during scanning using the at least two focus/detector systems; determining scattered radiation, wherein during scanning, scattered radiation emanates from at least one of the at least two focus/detector systems and falsifies measured values in another of the at least two focus/detector systems; correcting measured data of the focus/detector systems, at least with reference to the scattered radiation, before the reconstruction of the tomographic picture, wherein in order to determine a scattered radiation distribution, pre-scanning is carried out in which: the X-ray sources rotate about the examination object and a dose rate is modulated as a function of the rotation angle, no radiation dose is output over the majority of the revolution, at specific pre-scan angles, a dose rate is produced briefly and individually in each case by the X-ray sources of the focus/detector systems, and the received scattered radiation is measured simultaneously by the detector of the another of the at least two focus/detector systems.