<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">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_3960855145745969925gmail-:n0" style="direction:ltr;margin:8px 0px 0px;padding:0px;font-size:0.875rem"><div id="m_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:rgb(242,242,242) none repeat scroll 0% 0%;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_3960855145745969925gmail-:mz"><table role="presentation" style="border-collapse:collapse"><tbody><tr><td style="padding:0px 16px;vertical-align:top;width:44px"><img id="m_3960855145745969925gmail-:la_2" name="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_3960855145745969925gmail-:m0" role="link" style="border:1px solid rgb(116,119,117);display:inline-flex;font-size:0.875rem;background:rgba(0,0,0,0) none repeat scroll 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_3960855145745969925gmail-:ly" role="link" style="border:1px solid rgb(116,119,117);display:inline-flex;font-size:0.875rem;background:rgba(0,0,0,0) none repeat scroll 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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