How to suppress ring artefacts from a CT image?

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Kavitha Srinivasan 2013-7-11

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https://ww2.mathworks.cn/matlabcentral/answers/81726-how-to-suppress-ring-artefacts-from-a-ct-image

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 2013-7-11

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https://ww2.mathworks.cn/matlabcentral/answers/81726-how-to-suppress-ring-artefacts-from-a-ct-image#answer_91463

在 MATLAB Online 中打开

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 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 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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