Hi, my bad, taking it back (solved). Sorry. Pavel
Od: [email protected] Odesláno:čtvrtek 8. srpna 2019 8:47 Komu: [email protected] Předmět: Rtk-users Digest, Vol 83, Issue 2 Send Rtk-users mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit https://public.kitware.com/mailman/listinfo/rtk-users or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of Rtk-users digest..." Today's Topics: 1. RTK simulating projection from defined object (Shepp Logan like txt file) issue (Pavel Kudrna) ---------------------------------------------------------------------- Message: 1 Date: Thu, 8 Aug 2019 08:46:55 +0200 From: Pavel Kudrna <[email protected]> To: "[email protected]" <[email protected]> Subject: [Rtk-users] RTK simulating projection from defined object (Shepp Logan like txt file) issue Message-ID: <[email protected]> Content-Type: text/plain; charset="utf-8" Hi, I am prety new to RTK, but through I am learning with it I found a issue the is not clear to me. I followed the procedure from http://wiki.openrtk.org/index.php/RTK/Scripts/3DCG where I changed few things: 1) I simplified the Shepp Logan file to just simple sphere (in attachement). 2) I generated projections (using output_xml.xml ? two whole gantry rotation in two diffferent y offsets) ? the xml has been generated via python script (most of it-in attachment) which is reproducing procedure described in http://www.openrtk.org/Doxygen/DocGeo3D.html 3) Then I looked at the projections.mha in VolView (too large to send, please see the screenshot bellow) My questions are 2: 1) Why there is a shift in Y-Z quadrant in generated projections.mha? It should be perfectly alligned ? two of my colleagues has been so kind to check the procedure for me and found no mistake (the sinogram of sphere in the zero position(x=y=z=0) should be symetric perfectly) ? what I am doing wrong? 2) I simulated corrected projection byte by byte (into MHA) and then tried to use back-projection (rtkfdk) and Sart (rtksart)-you can see in output_xml.xml that the gantry angle is linear (not between -180? and 180? or between 0? and 360?), because when I put it into -180? and 180? it didn?t reconstruct anything properly ? why is it? It is not possible to use same angle value more then once in xml geometry file (even if it has different y shift of detector and source)? Purpose of this testing is that I am going to reconstruct data from helical CT, but my first attemattempt failed and I am going step by step to find out hat is wrong in my procedure. I use docker version of RTK given by http://wiki.openrtk.org/index.php/RTK_wiki_help Thank you? Kind regards? p. -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://public.kitware.com/pipermail/rtk-users/attachments/20190808/c3f7a7fb/attachment.html> -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: SheppLogan2.txt URL: <https://public.kitware.com/pipermail/rtk-users/attachments/20190808/c3f7a7fb/attachment.txt> -------------- next part -------------- A non-text attachment was scrubbed... Name: output_xml.xml Type: application/xml Size: 245302 bytes Desc: not available URL: <https://public.kitware.com/pipermail/rtk-users/attachments/20190808/c3f7a7fb/attachment.xml> -------------- next part -------------- A non-text attachment was scrubbed... Name: geometry.py Type: application/octet-stream Size: 3387 bytes Desc: not available URL: <https://public.kitware.com/pipermail/rtk-users/attachments/20190808/c3f7a7fb/attachment.obj> -------------- next part -------------- A non-text attachment was scrubbed... Name: 08FF49AC74FA430CA987CFB67043208B.png Type: image/png Size: 100598 bytes Desc: not available URL: <https://public.kitware.com/pipermail/rtk-users/attachments/20190808/c3f7a7fb/attachment.png> ------------------------------ Subject: Digest Footer _______________________________________________ Rtk-users mailing list [email protected] https://public.kitware.com/mailman/listinfo/rtk-users ------------------------------ End of Rtk-users Digest, Vol 83, Issue 2 ****************************************
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