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<p>Hello,</p>
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</p>
<p>Could you send the log file for each recon, this would probably help.</p>
<p><br>
</p>
<p>In the header files, the duration is set to 1s.</p>
<p>This would mean that if you have some projections with a time flag later than 1 second, they will be ignore in both cases. Could it be the problem ?</p>
<p><br>
</p>
<p>Best</p>
<p>Simon<br>
</p>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>De :</b> Castor-users <castor-users-bounces@lists.castor-project.org> de la part de Jafargholi Rangraz Esmaeel <Esmaeel.JafargholiRangraz@terumo-europe.com><br>
<b>Envoyé :</b> jeudi 29 juillet 2021 18:34<br>
<b>À :</b> castor-users@lists.castor-project.org<br>
<b>Objet :</b> [Castor-users] SPECT reconstruction with non-constant distance camera surface to COR</font>
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<p class="MsoNormal"><a name="_Hlk62726998"><span style="" lang="EN-GB">Dear Castor Developers and users,</span></a></p>
<p class="MsoNormal"><span style=""><span style="" lang="EN-GB"> </span></span></p>
<p class="MsoNormal"><span style=""><span style="" lang="EN-GB">I hope this email finds you well. I am trying to reconstruct SPECT imaging acquired by the Siemens Symbia gamma camera. In the SPECT acquisition, the distance between camera head and centre of
rotation was not constant for all projection angles. In castor input file, I provided this information using "Distance camera surface to COR" as described in the Castor Manual. The result was unexpected (visible misplacement of activity is visible; see arrow
in the attached image for NEMA phantom with 5 hot spheres). </span></span></p>
<p class="MsoNormal"><span style=""><span style="" lang="EN-GB"> </span></span></p>
<p class="MsoNormal"><span style=""><span style="" lang="EN-GB">I tried to reconstruct again the data with a constant camera distance using "Global distance camera surface to COR" with the value equal to the distance of the first projection angle and the results
were identical with the above mentioned reconstruction. So, I assume the way that I provide camera to COR distance is not appropriate. I am wondering if someone could help me to resolve this issue.</span></span></p>
<p class="MsoNormal"><span style=""><span style="" lang="EN-GB"> </span></span></p>
<p class="MsoNormal"><span style=""><span style="" lang="EN-GB">Attachments:</span></span></p>
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<span style=""><span style="font-size:10.0pt; font-family:Symbol" lang="EN-GB"><span style="">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><span dir="LTR"></span><span style="" lang="EN-GB">CASToR_synopsis.txt --> running synopsis</span></span></p>
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<span style=""><span style="font-size:10.0pt; font-family:Symbol" lang="EN-GB"><span style="">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><span dir="LTR"></span><span style="" lang="EN-GB">NEMA_tomo.cdh --> Header of input acquisition data with camera provided head and COR distance</span></span></p>
<p class="MsoNormal" style="margin-left:63.0pt; text-indent:-18.0pt; vertical-align:middle">
<span style=""><span style="font-size:10.0pt; font-family:Symbol" lang="EN-GB"><span style="">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><span dir="LTR"></span><span style="" lang="EN-GB">NEMA_tomo_constantCOR.cdh --> Header of input acquisition data with constant head and COR distance</span></span></p>
<p class="MsoNormal" style="margin-left:63.0pt; text-indent:-18.0pt; vertical-align:middle">
<span style=""><span style="font-size:10.0pt; font-family:Symbol" lang="EN-GB"><span style="">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><span dir="LTR"></span><span style="" lang="EN-GB">Screenshot_recons.png --> screenshot of recons (first row: recon of NEMA_tomo.cdh/ second row: recon of NEMA_tomo_constantCOR.cdh / third row: difference between first two recons)</span></span></p>
<p class="MsoNormal"><span style=""><span style="font-size:10.0pt; font-family:"Segoe UI",sans-serif"> </span></span></p>
<p class="MsoNormal"><span style=""><span style="font-size:10.0pt; font-family:"Segoe UI",sans-serif"> </span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style=""><i><span style="font-size:10.0pt; font-family:"Segoe UI",sans-serif" lang="NL">kind regards,</span></i></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style=""><b><span style="font-size:10.0pt; font-family:"Segoe UI",sans-serif" lang="NL">Esmaeel Jafargholi Rangraz</span></b></span></p>
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<p class="MsoNormal"> </p>
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