<div dir="ltr"><div>Please read the ITK documentation defining origin, spacing and direction:</div><div><a href="https://itk.org/ITKSoftwareGuide/html/Book1/ITKSoftwareGuide-Book1ch4.html#x45-500004.1">https://itk.org/ITKSoftwareGuide/html/Book1/ITKSoftwareGuide-Book1ch4.html#x45-500004.1</a></div><div>You probably want to update the origin when you change the direction indeed. Spacing should not be changed.<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Oct 26, 2023 at 10:18 AM 小哈 <<a href="mailto:2310447681@qq.com">2310447681@qq.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，<br>Thank you for your answer. </div><div> I would like to know the meaning of the direction parameter matrix, or how should I set it? If my other parameters, such as spacing and origin, need to be modified after setting the new direction matrix. Thank you.</div><div><div><br></div><div><br></div><div style="font-size:12px;font-family:Arial Narrow;padding:2px 0px">------------------ Original ------------------</div><div style="font-size:12px;background:rgb(239,239,239) none repeat scroll 0% 0%;padding:8px"><div><b>From:</b> "rtk-users" <<a href="mailto:rtk-users-request@creatis.insa-lyon.fr" target="_blank">rtk-users-request@creatis.insa-lyon.fr</a>>;</div><div><b>Date:</b> Thu, Oct 26, 2023 10:58 AM</div><div><b>To:</b> "rtk-users"<<a href="mailto:rtk-users@creatis.insa-lyon.fr" target="_blank">rtk-users@creatis.insa-lyon.fr</a>>;</div><div></div><div><b>Subject:</b> Rtk-users Digest, Vol 129, Issue 6</div></div><div><br></div>Send Rtk-users mailing list submissions to<br> <a href="mailto:rtk-users@creatis.insa-lyon.fr" target="_blank">rtk-users@creatis.insa-lyon.fr</a><br><br>To subscribe or unsubscribe via the World Wide Web, visit<br> <a href="https://www.creatis.insa-lyon.fr/mailman/listinfo/rtk-users" target="_blank">https://www.creatis.insa-lyon.fr/mailman/listinfo/rtk-users</a><br>or, via email, send a message with subject or body 'help' to<br> <a href="mailto:rtk-users-request@creatis.insa-lyon.fr" target="_blank">rtk-users-request@creatis.insa-lyon.fr</a><br><br>You can reach the person managing the list at<br> <a href="mailto:rtk-users-owner@creatis.insa-lyon.fr" target="_blank">rtk-users-owner@creatis.insa-lyon.fr</a><br><br>When replying, please edit your Subject line so it is more specific<br>than "Re: Contents of Rtk-users digest..."<br><br><br>Today's Topics:<br><br> 1. Reconstruction of CBCT using FDK algorithm<br> (=?gb18030?B?0KG5/g==?=)<br><br><br>----------------------------------------------------------------------<br><br>Message: 1<br>Date: Thu, 26 Oct 2023 10:42:24 +0800<br>From: "=?gb18030?B?0KG5/g==?=" <<a href="mailto:2310447681@qq.com" target="_blank">2310447681@qq.com</a>><br>To: "=?gb18030?B?cnRrLXVzZXJz?=" <<a href="mailto:rtk-users@creatis.insa-lyon.fr" target="_blank">rtk-users@creatis.insa-lyon.fr</a>><br>Subject: [Rtk-users] Reconstruction of CBCT using FDK algorithm<br>Message-ID: <<a href="mailto:tencent_91E92C870E98F19F54C791653A1F3BCDAB0A@qq.com" target="_blank">tencent_91E92C870E98F19F54C791653A1F3BCDAB0A@qq.com</a>><br>Content-Type: text/plain; charset="gb18030"<br><br>Hello,<br> In the image reconstructed using the FDK algorithm of the RTK package, the cross-sectional and coronal images were rotated counterclockwise by 90 degrees, as shown in the following figure.<br>May I know how to modify the command line to reconstruct the image in the normal direction? 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