<div dir="ltr"><div>Hi,</div><div>It's hard to help without having a look at your dcm files. From the screenshot, it seems that your projections are very small, I would check the pixel size of them and whether they are centered.<br></div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Nov 26, 2021 at 9:44 AM Attila Nagy <<a href="mailto:anagy@spinotron.hu">anagy@spinotron.hu</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">Hi,<div><br></div><div>I have 20 projections of a target and I would like to understand what can I do wrong because my result is bad.</div><div><br></div><div>So, here are the parameters of the system:</div><div><span id="gmail-m_-1213419464978684242gmail-m_2276957229204602296gmail-docs-internal-guid-56429939-7fff-00f0-db61-a001d04e1b0a"><ul style="margin-top:0px;margin-bottom:0px"><li dir="ltr" style="margin-left:15px;list-style-type:disc;font-size:11pt;font-family:"Times New Roman";color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"><p dir="ltr" role="presentation" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline">SID: </span><span style="font-size:11pt;background-color:transparent;font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline">83.9 cm</span></p></li><li dir="ltr" style="margin-left:15px;list-style-type:disc;font-size:11pt;font-family:"Times New Roman";color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"><p dir="ltr" role="presentation" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline">SDD: </span><span style="font-size:11pt;background-color:transparent;font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline">131.0 cm</span></p></li><li dir="ltr" style="margin-left:15px;list-style-type:disc;font-size:11pt;font-family:"Times New Roman";color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"><p dir="ltr" role="presentation" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline">SourceOffsetY: </span><span style="font-size:11pt;background-color:transparent;font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline">1.42 cm</span></p></li><li dir="ltr" style="margin-left:15px;list-style-type:disc;font-size:11pt;font-family:"Times New Roman";color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"><p dir="ltr" role="presentation" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline">SourceOffsetX: </span><span style="font-size:11pt;background-color:transparent;font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline">1.42 cm</span></p></li><li dir="ltr" style="margin-left:15px;list-style-type:disc;font-size:11pt;font-family:"Times New Roman";color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"><p dir="ltr" role="presentation" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline">DetectorOffsetY:</span><span style="font-size:11pt;background-color:transparent;font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline"> -1.07 cm</span></p></li><li dir="ltr" style="margin-left:15px;list-style-type:disc;font-size:11pt;font-family:"Times New Roman";color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"><p dir="ltr" role="presentation" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline">DetectorOffsetX: </span><span style="font-size:11pt;background-color:transparent;font-weight:700;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline">-1.07 cm</span></p></li><li dir="ltr" style="margin-left:15px;list-style-type:disc;font-size:11pt;font-family:"Times New Roman";color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"><p dir="ltr" role="presentation" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="background-color:transparent;font-size:11pt">Gantry Angle: depends on the particular projection.</span><br></p></li></ul><div><font face="Times New Roman" color="#000000"><span style="font-size:14.6667px;white-space:pre-wrap"><br></span></font></div><div><font face="Times New Roman" color="#000000"><span style="font-size:14.6667px;white-space:pre-wrap">The detector is a </span></font>Mercu1717V. Pixel matrix is 3072x3072, the detector effective area is: 427.008×427.008mm</div><div><br></div><div>I ran these commands:</div><div>rtksimulatedgeometry.exe -o geometry.xml -f 0 -n 20 --sdd 1310 --sid=839 --proj_iso_x=0 --proj_iso_y=0 --source_x=0 --source_y=0<br></div><div>rtkfdk -g geometry.xml -p ./dcm -r .*.dcm -o fdk.mha --hann 0.5 --pad 1.0 --verbose<br></div><div><br></div><div>and the result is:</div><div><a href="https://gyazo.com/1aec04c1be241e39c483e208ded2bc86" target="_blank">https://gyazo.com/1aec04c1be241e39c483e208ded2bc86</a><br></div><div><br></div><div>The proj_iso_* and source_* parameters are 0 because I got an error with the values above.</div><div><br></div><div>I'm new in the RTK and CBCT world so I have to learn a lot of these things.</div><div><br></div><div>Thank you for any help!</div></span></div><div><div dir="ltr"><div dir="ltr"><br><div><div><span style="color:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:14.6667px">Regards,</span></div><div><span style="color:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:14.6667px">Attila Nagy</span></div><div><span style="color:rgb(77,81,86);font-family:arial,sans-serif;font-size:14px">Spinotron Magyar Sugársebészeti Innováció</span><span style="color:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:14.6667px"><span style="color:rgb(34,34,34);font-family:Arial,Helvetica,sans-serif;font-size:12.8px"> Kft. - <a href="http://www.spinotron.hu/" style="color:rgb(17,85,204)" target="_blank">http://www.spinotron.hu/</a></span><br style="color:rgb(34,34,34);font-family:Arial,Helvetica,sans-serif;font-size:small"><div style="color:rgb(34,34,34);font-family:Arial,Helvetica,sans-serif;font-size:small"></div></span></div></div></div></div></div></div>
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