<div dir="ltr"><div><div>Dear Freyman li,<br></div>Have you solved your problem ? If not, my guess would be that you have not set the origin of your projections correctly. Where does your calibration assume the location of point (0,0) in your projections? Since you have very small X projection offsets, it probably assumes that it's at the center of the projection so you must set the origin, i.e., the coordinate of the first pixel, at (0.5*0.254*767, 0.5*0.254*959). If you don't do that, rtkfdk detects a large offset that it cannot correct for.<br></div>Simon<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Dec 14, 2015 at 6:32 AM, Freyman li <span dir="ltr"><<a href="mailto:lihanwei_1500@126.com" target="_blank">lihanwei_1500@126.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div link="blue" vlink="#954F72" lang="ZH-CN"><div><p class="MsoNormal"><span style="font-size:10.5pt" lang="EN-US">Thanks for your help! I attached the geometry settings to this email. And my detector size is 768*960 with a pixel size 0.254mm.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:10.5pt" lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10.5pt;color:#1f497d" lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10.5pt;color:#1f497d" lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10.5pt;color:#1f497d" lang="EN-US"><u></u> <u></u></span></p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm 0cm 0cm"><p class="MsoNormal"><b><span style="font-family:"\005fae\008f6f\0096c5\009ed1",sans-serif">发件人<span lang="EN-US">:</span></span></b><span style="font-family:"\005fae\008f6f\0096c5\009ed1",sans-serif" lang="EN-US"> louie L [mailto:<a href="mailto:ghostcz@hotmail.com" target="_blank">ghostcz@hotmail.com</a>] <br></span><b><span style="font-family:"\005fae\008f6f\0096c5\009ed1",sans-serif">发送时间<span lang="EN-US">:</span></span></b><span style="font-family:"\005fae\008f6f\0096c5\009ed1",sans-serif" lang="EN-US"> 2015</span><span style="font-family:"\005fae\008f6f\0096c5\009ed1",sans-serif">年<span lang="EN-US">12</span>月<span lang="EN-US">14</span>日<span lang="EN-US"> 11:38<br></span><b>收件人<span lang="EN-US">:</span></b><span lang="EN-US"> Freyman li; <a href="mailto:rtk-users@public.kitware.com" target="_blank">rtk-users@public.kitware.com</a><br></span><b>主题<span lang="EN-US">:</span></b><span lang="EN-US"> RE: [Rtk-users] Rtk Detector Displacemets<u></u><u></u></span></span></p></div></div><div><div class="h5"><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">Sent from <a href="http://go.microsoft.com/fwlink/?LinkId=550986" target="_blank">Mail</a> for Windows 10<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif" lang="EN-US"><u></u> <u></u></span></p><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm 0cm 0cm"><p class="MsoNormal"><span lang="EN-US"><br><b>From: </b><a href="mailto:ghostcz@hotmail.com" target="_blank">louie L</a><br><b>Sent: </b>Monday, December 14, 2015 04:38<br><b>To: </b><a href="mailto:lihanwei_1500@126.com" target="_blank">Freyman li</a><br><b>Subject: </b>RE: [Rtk-users] Rtk Detector Displacemets<u></u><u></u></span></p></div><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif" lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">Hi,<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">Can you post your geometry file to the mail list? Your problem sounds like a result of wrong geometry settings.<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">Best regards,<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US">Louie<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">Sent from <a href="http://go.microsoft.com/fwlink/?LinkId=550986" target="_blank">Mail</a> for Windows 10<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif" lang="EN-US"><u></u> <u></u></span></p><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm 0cm 0cm"><p class="MsoNormal"><span lang="EN-US"><br><b>From: </b><a href="mailto:lihanwei_1500@126.com" target="_blank">Freyman li</a><br><b>Sent: </b>Monday, December 14, 2015 04:25<br><b>To: </b><a href="mailto:Rtk-users@public.kitware.com" target="_blank">Rtk-users@public.kitware.com</a><br><b>Cc: </b><a href="mailto:rtk-users@openrtk.org" target="_blank">rtk-users@openrtk.org</a><br><b>Subject: </b>[Rtk-users] Rtk Detector Displacemets<u></u><u></u></span></p></div><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif" lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">Dear rtk-users,<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">I have generated the geometry XML file by using the geometry calibration in my CBCT system. And I want to reconstruct the volume from 360 raw projections data.<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US">But after running the rtkfdk.cxx, I get an output message that "Cannot account for too large detector displacements, a part of space must be covered by all projections."<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US">And I try to use the addprojection function to generate a simple geometry structure using only SID and SDD, this problem did not happen but the reconstruction result is not correct.<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US">How can I solve this problem? Is there any limitation about the detector weighting?<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">I really appreciate any help you can provide.<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">With regards,<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US">Freyman li<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p></div></div></div></div><br>_______________________________________________<br>
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