[Rtk-users] R: R: Ring Artifacts correction

[gabriele.belotti.bergamo at gmail.com]

Thank you both for the help!
While I was reading Simon’s PhD student’s thesis I realized that stripes in my sinogram are actually horizontal and not random/pixel specific (rather projection specific).
They could represent a shift in gain response by the whole detector (there is an adaptive gain option in the acquisition that I must investigate), as projection by projection there is a tangible inconsistency in the average intensity value (see spikes in attached images as reference).

Again, thank you for your time, hope this might be of interest to you as well.

Gabriele

 

Da: Simon Rit <simon.rit at creatis.insa-lyon.fr> 
Inviato: giovedì 9 luglio 2020 16.06
A: Samuel Gerber <samuel.gerber at kitware.com>
Cc: gabriele.belotti.bergamo at gmail.com; rtk-users <rtk-users at public.kitware.com>
Oggetto: Re: [Rtk-users] R: Ring Artifacts correction

 

Excellent! Thanks for sharing.

 

On Thu, Jul 9, 2020 at 3:33 PM Samuel Gerber <samuel.gerber at kitware.com <mailto:samuel.gerber at kitware.com> > wrote:

This: https://github.com/InsightSoftwareConsortium/ITKRingArtifact

might be of interest.

 

Best,

Sam

 

 

On Thu, Jul 9, 2020 at 9:30 AM Simon Rit <simon.rit at creatis.insa-lyon.fr <mailto:simon.rit at creatis.insa-lyon.fr> > wrote:

Hi Gabriele,

There is nothing readily available in RTK, sorry. A PhD student working with me worked on that but using python scripts, see his PhD thesis here <https://www.creatis.insa-lyon.fr/~srit/biblio/pivot2019.pdf> , chapter 7.

Simon

 

On Thu, Jul 9, 2020 at 2:57 PM <gabriele.belotti.bergamo at gmail.com <mailto:gabriele.belotti.bergamo at gmail.com> > wrote:

Dear all,

I’m forwarding this email as the original had an image that was blocked from the mailing list due to overall size.

Gabriele

 

Da: gabriele.belotti.bergamo at gmail.com <mailto:gabriele.belotti.bergamo at gmail.com>  <gabriele.belotti.bergamo at gmail.com <mailto:gabriele.belotti.bergamo at gmail.com> > 
Inviato: mercoledì 1 luglio 2020 11.51
A: rtk-users at public.kitware.com <mailto:rtk-users at public.kitware.com> 
Oggetto: Ring Artifacts correction

 

Dear Rtk users and developers,

I have a set of projections that suffer both from truncation and ring artifacts.
While for the first issue I’ve been fiddling with the --pad option to a satisfying result, I’m unsure what would be the best way to deal with the ring artifacts in RTK.
I’ll attach a screenshot of the sinogram showing evident strikes and an animated gif with the resulting reconstruction highlighting the concentric rings.

Thanks in advance for your help and input!

Gabriele Belotti

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-- 

Samuel Gerber
R&D Engineer
Kitware, Inc.

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