Pore3D offers several filters for the removal of CT ring artifacts. This issue can be faced in the sinogram domain but also in the reconstructed domain by transforming a reconstructed slice into polar coordinates assuming the center of rings as the center of the Cartesian-to-polar conversion. This latter approach avoids the need of additional imaging data (i.e. images for flat fielding correction and sinogram images).

Artificial test images (ground truth plus corrupted image) are here reported. Python code (exploiting the NumPy and SciPy libraries) is also here publicly offered for scientific purposes.

More details can be found in:

[1] F. Brun, G. Kourousias, D. Dreossi, L. Mancini, G. Tromba. A comparative evaluation of ring artifacts reduction filters for X-ray computed microtomography images. Proc. of the 18th International Conference on Image Processing (ICIP), pp. 405-408, Sept. 11-14, Bruxelles (Belgium), 2011.

[2] F. Brun, A. Accardo, G. Kourousias, D. Dreossi, R. Pugliese. Effective implementation of ring artifacts removal filters for synchrotron radiation microtomographic images. Proc. of the 8th International Symposium on Image and Signal Processing (ISPA), pp. 672-676, Sept. 4-6, Trieste (Italy), 2013.