How to suppress ring artefacts from a CT image?

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Kavitha Srinivasan
Kavitha Srinivasan 2013-7-11
Dear all
I reconstructed a set of CT images analytically. But my images have got concentric rings depicted on it. I want to get rid of those ring-like structure as this artefact affects not only the image quality but the mean values of ROI(region-of-interest). Is there any algorithm available in Matlab to remove those rings. Are there any filters available to improve the image quality.
Regards

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Matt J
Matt J 2013-7-11
This algorithm is a popular one
http://www.visielab.ua.ac.be/sites/default/files/pmb04.pdf
The MATLAB code required for it is brief, but I'm not allowed to release mine :-)
If the rings are strong enough to badly affect ROI means, though, I wonder if enough effort has been made to reduce them through calibration.
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Kavitha Srinivasan
Kavitha Srinivasan 2013-7-12
Is there anything for streaks? My images have got some radial streaks around materials whose density differ from the background(say, some teflon rods in tissue equivalent material)
Matt J
Matt J 2013-7-12
编辑：Matt J 2013-7-12
These issues are very much tied to CT specifically. It would be great, I think, if MathWorks offered a CT Toolbox with some of the common de-artifacting techniques. Sadly, though, it does not.

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