A Self-consistent Method for Ring Artefact Correction in Tomographic Images

Abstract

A new, self-consistent method for the removal of ring-shaped artifacts in reconstructed tomographic images is presented, based on a different approach with respect to the currently adopted algorithms. Here, either afiltering of the sinogram or a modification of the final image could introduce further distortions. Starting from the difference between the original and a re-projected sinogram, our method is based on a dominant mode analysis similar to that originally introduced by Karhunen and Loeve. The algorithm has been tested numerically, and evidences of its accuracy are provided.