Method for correction of artifacts arising from temporal changes of attenuation values

摘要

A method for correcting artifacts in an image dataset reconstructed by filtered back projection is proposed. The artifacts are occurred as a result of temporal changes of attenuation values during rotational recording of X-ray projection images with an angular speed. A linear, analytically-derived, filter-type relationship between the attenuation values of the image dataset at a reference point and the real attenuation values is determined from the sum of a respective application of an angle speed-dependent weighting factor, a point spread function and a temporal derivation, evaluated at the reference time. The linear relationship is inverted and the inverted linear relationship is applied to the attenuation values of the image dataset for the correction.