Patent ID: 7430270

Claim:
A Computerized tomography method comprising the steps of: generating a conical beam traversing an examination area by means of a radiation source; generating a helical nPi relative movement between the radiation source and the examination area; acquiring measured values, which depend on the intensity in the beam by means of a detector unit, where a ray of the beam is assigned to each measured value; and reconstructing a CT image by means of the steps of: performing a partial derivation of the measured values according to the angular position of the radiation source; generating intermediate filter values, where an intermediate filter value is generated by filtering a derived measured value, which lie in an nPi window, along an associated filter line with a κ-filter, and where, for at least one of those derived measured values, more than one filter line is associated; multiplying each intermediate filter value by a corresponding different filter factor, where each intermediate filter value that has been generated is multiplied by its corresponding filter factor, which is greater than or equal to the filter factors by which the other intermediate filter values are multiplied; adding the weighted intermediate filter values of each measured value that lies in the nPi window to each respective filter value; and reconstructing the CT image by back-projection of the filter values.