Iterative ct - image reconstruction in combination with a four-dimensional noise filter

摘要

The present invention relates to a process for the reconstruction of image data (f (t *)) of an object to be examined from measurement data, wherein the measurement data is in the case of a relative rotational movement between a radiation source of a computer tomography system and the object to be examined were detected. There are first image data (f * (t *)) is calculated by the measurement data (p_in(T *)) in order to achieve a certain gray value characteristic of the first to be reconstructed image data (f * (t *)) are modified, and the first image data (f * (t *)) by means of an iterative algorithm using the modified measurement data are calculated. Furthermore, second image data (f * * (t *)) is calculated by a series of temporally successive images can be reconstructed and a temporal noise reducing processing of the series of images occurs. Finally, a combination of the first (f * (t *)) and the second (f * * (t *)) is carried out image data.