<div dir="ltr"><div>Please stay on the mailing list, the conversation might be interesting for other users.</div><div>You can use two projections and launch the reconstruction but the result will be far from a 3D image of the object. Check for example figure 7 in <a href="http://doi.org/10.1016/j.media.2010.03.005" target="_blank">doi.org/10.1016/j.media.2010.03.005</a><button class="clickandreadBtn" title="Ressource found in PANIST" name="CLICKANDREADLink" onclick="window.open('https://api.panist.fr/document/894066CA8548FB486A3AFED84B723CBAFB933E01/fulltext/pdf?sid=clickandread','_blank');logClickEvent({"sid":"clickandread","source":"PANIST","url":"https://api.panist.fr/document/894066CA8548FB486A3AFED84B723CBAFB933E01/fulltext/pdf?sid=clickandread","urlOrigine":"https://mail.google.com/mail/u/0/#inbox/FMfcgzGkXSVmklNcQxRXQGQxMFnznZlg","etab":"cnr","level":"info","message":"open access","timestamp":"2021-05-21T07:55:11.246Z","doi":"10.1016/j.media.2010.03.005"})"><img src="data:image/svg+xml;base64,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" width="27"></button>.</div><div>I doubt Varian or IBA claim 3D reconstruction from 2 projections...<br></div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, May 21, 2021 at 9:35 AM gwoodstccd <<a href="mailto:gwoodstccd@protonmail.com" target="_blank">gwoodstccd@protonmail.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>Hi Simon，<br></div><div><br></div><div>Thank you for quick response.<br></div><div><br></div><div>About question 2, Two projections are at different angle. The first image is AP direction, the second is LR direction. Can these make reconstruction?<br></div><div><br></div><div>I know some proton/photon Radiotherapy device can reconstruct these images, like Varian TrueBeam/Probeam, IBA Proteus.</div><div><br></div><div><div><br></div><div>BR,<br></div><div>George</div></div><div><br></div><div>‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐<br></div><div> On 2021年5月21日FridayPM3点21分, Simon Rit <<a href="mailto:simon.rit@creatis.insa-lyon.fr" target="_blank">simon.rit@creatis.insa-lyon.fr</a>> wrote:<br></div><div> <br></div><blockquote type="cite"><div dir="ltr"><div>Hi,<br></div><div>1. Yes, simply change the dimension and origin to make it 3D, for example to --dimension 1024 --origin -127.875 which will set the same values for the three dimensions.<br></div><div>2. No, you need more than 2 projection to reconstruct a 3D image. I think you need to read some books on tomography to understand this.<br></div><div>3. There are a few datasets on the RTK wiki. You can find some datasets for lungs and liver <a href="https://image-x.sydney.edu.au/spare-challenge/" target="_blank">here</a>.<br></div><div>Best regards,<br></div><div>Simon<br></div></div><div><br></div><div class="gmail_quote"><div dir="ltr">On Fri, May 21, 2021 at 6:46 AM gwoodstccd 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>Hello all,<br></div><div><br></div><div>I'm one newbie for ITK/RTK. I have some programming experience, but for image processing is totally new for me. <br></div><div><br></div><div>I have 3 basic questions:<br></div><div><br></div><div>1. when I run example for reconstructing Elekta CBCT sequence from <a href="https://wiki.openrtk.org/index.php/RTK/Examples/ElektaReconstruction" target="_blank">https://wiki.openrtk.org/index.php/RTK/Examples/ElektaReconstruction</a>.<br></div><p style="margin:0.5em 0px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial"><span style="background-color:rgb(255,255,255)"><span style="font-family:sans-serif"><span style="font-size:14px"><span style="color:rgb(108,166,217)">. Reconstruct elekta-data using RTK applications such as rtkfdk algorithm. In this case, we reconstruct just one axial slice (29.5) of the whole volume:</span></span></span></span><span style="color:rgb(108,166,217)"></span><br></p><pre style="font-family:monospace,monospace;color:rgb(0,0,0);background-color:rgb(248,249,250);border:1px solid rgb(234,236,240);padding:1em;white-space:pre-wrap;line-height:1.3;font-size:14px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial"><span style="color:rgb(108,166,217)"> rtkfdk \
--lowmem \
--geometry elektaGeometry \
--path img_1.3.46.423632.135428.1351013645.166/ \
--regexp '.*.his' \
--output slice29.5.mha \
--verbose \
--spacing 0.25,0.25,0.25 \
--dimension 1024,1,1024 \
--origin -127.875,29.5,-127.875</span> <br></pre><div><div><br></div><div>In this step, only one <span style="background-color:rgb(255,255,255)"><span style="font-family:sans-serif"><span style="font-size:14px"><span style="color:rgb(34,34,34)">axial slice is reconstructed to *.mha file. My question is that can I reconstruct all slices as one 3D image file?</span></span></span></span><br></div><div><br></div><div><span style="background-color:rgb(255,255,255)"><span style="font-family:sans-serif"><span style="font-size:14px"><span style="color:rgb(34,34,34)">2. I have two kV-kV images, they are orthogonal. Can I use RTK to reconstruct 3D image? If yes, one guideline or example is welcome.</span></span></span></span><br></div><div><br></div><div><span style="background-color:rgb(255,255,255)"><span style="font-family:sans-serif"><span style="font-size:14px"><span style="color:rgb(34,34,34)">3. Could someone please share me some free test dataset for radiotherapy CBCT IGRT purpose including PlanCT and CBCT sequence? I want to use these data for reconstruction and registration with ITK and RTK?</span></span></span></span><br></div><div><br></div><div>Much appreciated for responses.<br></div><div><br></div><div>George Woods<br></div><div><br></div><div>Sent with <a href="https://protonmail.com" target="_blank">ProtonMail</a> Secure Email.<br></div></div><div><br></div><div><br></div><div>_______________________________________________<br></div><div> Rtk-users mailing list<br></div><div> <a href="mailto:Rtk-users@public.kitware.com" target="_blank">Rtk-users@public.kitware.com</a><br></div><div> <a href="https://public.kitware.com/mailman/listinfo/rtk-users" rel="noreferrer" target="_blank">https://public.kitware.com/mailman/listinfo/rtk-users</a><br></div></blockquote></div></blockquote><div><br></div></blockquote></div>