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

Answer 1

[Matt J]

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.

[Kavitha Srinivasan]

Thanks for the help. The rings in my images do not affect the ROI means that much, but on the whole affects the quality of the image, like, uniformity. Is there any built-in code available for me to try on. Thanks

[Matt J]

No, nothing built-in, I'm afraid.

[Kavitha Srinivasan]

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]

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.