<div dir="ltr"><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>hi Simon thanks for your reply, but I still have some question ,</div><div><br></div><div>1) This is for non-rigid motion. If the motion is rigid, it can be compensated by adjusting the source and detector positions and orientation wrt to the object in the geometry file.</div><div>--> So this example is not suitable for dental CBCT? Or the motion blur of dental CBCT can be ignored in the RTK algorithm because the motion is rigid? </div><div><br></div><div>2) Again, detector parallel to isocenter is meaning less, the isocenter is a point. And the goal of the geometry description is no to "make them parallel" but to account for the actual geometry of the system wrt scanned object.</div><div>--> If I need to ad adjust the Slant Case (the pic below is )，What methods or parameters can I use to adjust it?</div><div><img src="cid:ii_le6rkiy12" alt="image200.png" width="208" height="208" style="margin-right: 0px;"></div><div><br></div><div>(Pic form <span style="font-size:13px;font-family:Arial,sans-serif">Wang, Zhao, et al. "Improvements in micro-CT method for characterizing x-ray monocapillary optics." </span><i style="font-size:13px;font-family:Arial,sans-serif">Optics Communications</i><span style="font-size:13px;font-family:Arial,sans-serif"> 504 (2022): 127474)</span><br></div><div><br></div><div>3) If I want to try to use dental CBCT or chest cavity CBCT to implement and study the MCCBCTReconsttruction <a href="https://wiki.openrtk.org/index.php/RTK/Examples/MCCBCTReconstruction#Deformation_vector_field">example</a>, how can I collect or generate deformat.mha and motion signal.txt ? </div><div><br></div><div>Thanks for reply again. </div><div><br></div><div>BR,</div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Simon Rit <<a href="mailto:simon.rit@creatis.insa-lyon.fr">simon.rit@creatis.insa-lyon.fr</a>> 於 2023年2月13日 週一 下午5:40寫道：<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>1) This is for non-rigid motion. If the motion is rigid, it can be
compensated by adjusting the source and detector positions and
orientation wrt to the object in the geometry file.</div><div>2) Again,
detector parallel to isocenter is meaning less, the isocenter is a
point. And the goal of the geometry description is no to "make them
parallel" but to account for the actual geometry of the system wrt
scanned object.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Feb 13, 2023 at 9:44 AM 何明哲 <<a href="mailto:m10512067@yuntech.org.tw" target="_blank">m10512067@yuntech.org.tw</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><div dir="ltr"><div dir="ltr">Hi Simon </div><div dir="ltr">Thanks for reply，</div><div dir="ltr"><br></div><div dir="ltr">1) I understand what you mean, I will be check out geometric parameter again , but if there is a motion blur caused by the motion of the gantry, is there any suggested way to correct it? I have reference to <a href="https://wiki.openrtk.org/index.php/RTK/Examples/MCCBCTReconstruction#Deformation_vector_field" target="_blank">RTK/Examples/MCCBCTReconstruction</a>, but this is an example of the motion signal of the chest cavity, If it is dental CBCT case, which file or format should the motion signal be in? Or is there a document for reference? </div><div dir="ltr"><br></div><div dir="ltr">2) Thanks for your reply, I understand, because the source is considered as a point, so if the detector is not parallel to the ISO Center, I just adjust the out of plane angle to make them parallel, am I right? </div><div dir="ltr"><br></div><div dir="ltr">The picture below is</div><div dir="ltr"><br></div><div dir="ltr"><img src="cid:ii_le2jxouv1" alt="圖片1.bmp" width="400" height="270"></div><div dir="ltr"><br></div><div dir="ltr"><div>thanks for your reply,</div><div>BR,</div><div><br></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Simon Rit <<a href="mailto:simon.rit@creatis.insa-lyon.fr" target="_blank">simon.rit@creatis.insa-lyon.fr</a>> 於 2023年2月13日 週一 下午2:32寫道：<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>1) I don't think this is due to detector blur. It seems to be a geometric problem. But it is hard to adjust it manually, this is generally calibrated.</div><div>2) I'm not sure I understand what your mean by "parallel to the source" as the source is assumed to be a point. If you only change SID, SDD, the 2 source and detector X/Y offsets, the Gantry Angle and the in plane angle, the detector is parallel to the rotation axis. The out of plane angle is the angle between the axis and the detector.</div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Feb 10, 2023 at 12:02 PM 何明哲 <<a href="mailto:m10512067@yuntech.org.tw" target="_blank">m10512067@yuntech.org.tw</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"><br clear="all"><div><div dir="ltr"><div dir="ltr"><div style="border-left:medium none;padding:0px;display:flex;font-family:"Google Sans",Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:medium"><div style="margin:0px;padding:0px 0px 20px;width:2628px"><div><div id="m_2101623019685922154m_-1970241752549401556m_3444285452456703648m_3960855145745969925gmail-:n0" style="direction:ltr;margin:8px 0px 0px;padding:0px;font-size:0.875rem"><div id="m_2101623019685922154m_-1970241752549401556m_3444285452456703648m_3960855145745969925gmail-:lv" style="font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:small;line-height:1.5;font-family:Arial,Helvetica,sans-serif;overflow:hidden"><div dir="ltr">Hi All <div><br></div><div>I have use the CudaFDKConeBeamReconstructionFilter algorithm to reconstruct a set of CBCT images, </div><div>1. )but I found that each slices contains blurry image area , because I was using a flat panel detector , so I tried to adjust the source offset , inofplaneangle and outofplaneangle , but the blurry image area still at there, could this be due to detector motion blur effect? Or is there a suggested way to correct it?</div><div><br></div><div>2). From the reference <a href="http://www.openrtk.org/Doxygen/DocGeo3D.html" target="_blank">http://www.openrtk.org/Doxygen/DocGeo3D.html</a> I can know that adjusting the source offset and inofplaneangle / outofplaneangle can ensure that the detector remains parallel to the source, But how can I make sure that the Z-axis of the ISO, the detector and the source are also kept parallel at the same time, Can I achieve this by adjusting any parameters or using any method?</div><div><br>The picture below is my result for Question 1.</div><div><img src="cid:ii_ldyf0f2j0" alt="圖片1.png" width="400" height="400"><br><div><div dir="ltr"><div dir="ltr"><div><br></div><div>thanks for your reply,</div><div>BR,<div></div><div><br></div></div></div></div></div></div></div><div></div></div></div><div style="border-bottom-left-radius:1px;border-bottom-right-radius:1px;padding:0px;width:auto;background:none 0% 0% repeat scroll rgb(242,242,242);margin:0px"></div></div></div><div style="clear:both"></div></div><div style="font-size:0.875rem;padding:0px;width:auto;border-bottom-left-radius:0px;border-bottom-right-radius:0px;border-top:medium none;margin:0px;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;font-family:"Google Sans",Roboto,RobotoDraft,Helvetica,Arial,sans-serif"><div style="border-top:0px none;padding:0px"><div style="clear:both;margin:0px;padding:16px 0px;border-top:medium none"><div id="m_2101623019685922154m_-1970241752549401556m_3444285452456703648m_3960855145745969925gmail-:mz"><table role="presentation" style="border-collapse:collapse"><tbody><tr><td style="padding:0px 16px;vertical-align:top;width:44px"><img id="m_2101623019685922154m_-1970241752549401556m_3444285452456703648m_3960855145745969925gmail-:la_2" name="m_2101623019685922154_m_-1970241752549401556_m_3444285452456703648_m_3960855145745969925_:la" src="https://lh3.googleusercontent.com/a/AEdFTp62JxvX9loEXx7_baRHm0clax6rdoy1Fu_kMhy1=s40-p-mo" style="display: block; width: 40px; height: 40px; border-radius: 50%;"></td><td style="padding:0px;width:2628px"><div style="box-sizing:border-box;border-radius:1px;padding:0px;border:medium none;margin:0px"><div style="color:inherit;height:auto;padding:0px;display:flex;line-height:20px"><span id="m_2101623019685922154m_-1970241752549401556m_3444285452456703648m_3960855145745969925gmail-:m0" role="link" style="border:1px solid rgb(116,119,117);display:inline-flex;font-size:0.875rem;background:none 0% 0% repeat scroll rgba(0,0,0,0);border-radius:18px;box-sizing:border-box;color:rgb(68,71,70);height:36px;outline:currentcolor none medium;padding:0px 16px 0px 12px;min-width:104px;margin-right:8px">回覆</span><span id="m_2101623019685922154m_-1970241752549401556m_3444285452456703648m_3960855145745969925gmail-:ly" role="link" style="border:1px solid rgb(116,119,117);display:inline-flex;font-size:0.875rem;background:none 0% 0% repeat scroll rgba(0,0,0,0);border-radius:18px;box-sizing:border-box;color:rgb(68,71,70);height:36px;outline:currentcolor none medium;padding:0px 16px 0px 12px;min-width:104px;margin-right:8px">轉寄</span></div></div></td></tr></tbody></table></div></div></div></div></div></div></div></div>
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