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<p class="MsoNormal"><a name="_Hlk62726998"><span lang="EN-GB" style="mso-fareast-language:#1000">Dear Castor Developers and users,<o:p></o:p></span></a></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk62726998"><span lang="EN-GB" style="mso-fareast-language:#1000"> <o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk62726998"><span lang="EN-GB" style="mso-fareast-language:#1000">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).
<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk62726998"><span lang="EN-GB" style="mso-fareast-language:#1000"> <o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk62726998"><span lang="EN-GB" style="mso-fareast-language:#1000">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.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk62726998"><span lang="EN-GB" style="mso-fareast-language:#1000"> <o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk62726998"><span lang="EN-GB" style="mso-fareast-language:#1000">Attachments:<o:p></o:p></span></span></p>
<p class="MsoNormal" style="margin-left:63.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;vertical-align:middle">
<span style="mso-bookmark:_Hlk62726998"><![if !supportLists]><span lang="EN-GB" style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:#1000"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span dir="LTR"></span><span lang="EN-GB" style="mso-fareast-language:#1000">CASToR_synopsis.txt --> running synopsis<o:p></o:p></span></span></p>
<p class="MsoNormal" style="margin-left:63.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;vertical-align:middle">
<span style="mso-bookmark:_Hlk62726998"><![if !supportLists]><span lang="EN-GB" style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:#1000"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span dir="LTR"></span><span lang="EN-GB" style="mso-fareast-language:#1000">NEMA_tomo.cdh --> Header of input acquisition data with camera provided head and COR distance<o:p></o:p></span></span></p>
<p class="MsoNormal" style="margin-left:63.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;vertical-align:middle">
<span style="mso-bookmark:_Hlk62726998"><![if !supportLists]><span lang="EN-GB" style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:#1000"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span dir="LTR"></span><span lang="EN-GB" style="mso-fareast-language:#1000">NEMA_tomo_constantCOR.cdh --> Header of input acquisition data with constant head and COR distance<o:p></o:p></span></span></p>
<p class="MsoNormal" style="margin-left:63.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1;vertical-align:middle">
<span style="mso-bookmark:_Hlk62726998"><![if !supportLists]><span lang="EN-GB" style="font-size:10.0pt;font-family:Symbol;mso-fareast-language:#1000"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span dir="LTR"></span><span lang="EN-GB" style="mso-fareast-language:#1000">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)<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk62726998"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk62726998"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif"><o:p> </o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_Hlk62726998"><i><span lang="NL" style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;mso-fareast-language:#1000">kind regards,<o:p></o:p></span></i></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_Hlk62726998"><b><span lang="NL" style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;mso-fareast-language:#1000">Esmaeel Jafargholi Rangraz<o:p></o:p></span></b></span></p>
<span style="mso-bookmark:_Hlk62726998"></span>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
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