Hi Simon, Thank you for your reply. I will try what you are suggesting and let you know.
Thibault On Fri, Aug 13, 2021 at 7:59 AM Simon Rit <simon....@creatis.insa-lyon.fr> wrote: > Hi, > I'm not sure but one thing is that after reconstruction, you should mask > out everything which is out of the field of view. This can be done with the > FieldOfViewImageFilter > <http://www.openrtk.org/Doxygen/classrtk_1_1FieldOfViewImageFilter.html> > to which you should pass the reconstructed image as first input, the > ProjectionsStack and the Geometry. > If this is not the issue, I would check that you have reconstructed the > whole field of view, that your projections do not have any truncation issue. > Simon > > On Wed, Aug 11, 2021 at 12:55 PM Thibault Pelletier via Rtk-users < > rtk-users@public.kitware.com> wrote: > >> Hi everyone, >> >> I'm currently implementing the NMAR algorithm using RTK and I have a >> problem regarding the forward projection step. >> >> To make sure my building blocks are correct, I decided to first read my >> projection stack using the rtk::ProjectionsReader class, do a FDK Cone Beam >> reconstruction and forward project this reconstructed image using the >> rtk::JosephForwardProjectionImageFilter class. >> >> I then compare the images that I have after reading my projection stack >> with the images that I have after my JosephForwardProjectionImageFilter >> pass. >> >> My problem is that the values I obtain are quite different (sinogram of >> the images attached). >> The forward projected images are overall 1.7 times brighter than the >> reader images. >> >> Does anyone have an insight on what I could be doing wrong? >> >> Thanks in advance, >> Thibault >> _______________________________________________ >> Rtk-users mailing list >> Rtk-users@public.kitware.com >> https://public.kitware.com/mailman/listinfo/rtk-users >> >
_______________________________________________ Rtk-users mailing list Rtk-users@public.kitware.com https://public.kitware.com/mailman/listinfo/rtk-users