<div dir="ltr">Hi Simon,<div><br></div><div>Thank you for your reply.</div><div>I will try what you are suggesting and let you know.</div><div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div><font color="#444444" face="tahoma, sans-serif">Thibault</font></div></div></div></div></div></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Aug 13, 2021 at 7:59 AM Simon Rit <<a href="mailto:simon.rit@creatis.insa-lyon.fr">simon.rit@creatis.insa-lyon.fr</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi,</div><div>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 <a href="http://www.openrtk.org/Doxygen/classrtk_1_1FieldOfViewImageFilter.html" target="_blank">FieldOfViewImageFilter</a> to which you should pass the reconstructed image as first input, the ProjectionsStack and the Geometry.</div><div>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.</div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Aug 11, 2021 at 12:55 PM Thibault Pelletier via Rtk-users <<a href="mailto:rtk-users@public.kitware.com" target="_blank">rtk-users@public.kitware.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi everyone,<div><br></div><div>I'm currently implementing the NMAR algorithm using RTK and I have a problem regarding the forward projection step.</div><div><br></div><div>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.</div><div><br></div><div>I then compare the images that I have after reading my projection stack with the images that I have after my JosephForwardProjectionImageFilter pass.</div><div><br></div><div>My problem is that the values I obtain are quite different (sinogram of the images attached).</div><div>The forward projected images are overall 1.7 times brighter than the reader images.</div><div><br></div><div>Does anyone have an insight on what I could be doing wrong?</div><div><br></div><div>Thanks in advance,</div><div><div><div dir="ltr"><div dir="ltr"><div>Thibault</div></div></div></div></div></div>
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