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<p class="MsoNormal"><span lang="EN-US">Hi Adolf,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Have you adjusted your production thresholds/cuts? It’s likely that you’re missing secondary and tertiary interactions due to the default cut off value of the world (1.0 mm).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Matthew<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:-webkit-standard;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:-webkit-standard;color:black">--</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:-webkit-standard;color:black">Matthew Strugari<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:-webkit-standard;color:black">PhD Candidate</span><span style="color:black"> at
</span><span lang="EN-US" style="font-size:10.5pt;font-family:-webkit-standard;color:black">Biomedical Translational Imaging Centre - BIOTIC,<br>
5890 University Ave, Halifax, NS, B3K 6R8</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Gate-users <gate-users-bounces@lists.opengatecollaboration.org> on behalf of Adolf Nordin <Adolfn@axim.co.za><br>
<b>Date: </b>Tuesday, June 15, 2021 at 10:29<br>
<b>To: </b>gate-users@lists.opengatecollaboration.org <gate-users@lists.opengatecollaboration.org><br>
<b>Subject: </b>[Gate-users] Simulated energy spectrum not same as actual energy spectrum<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:12.0pt;mso-line-height-rule:exactly"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:white">CAUTION:</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:white"> The Sender
of this email is not from within Dalhousie.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:white">H</span>i<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I’ve hit 2 walls, bit want to sort the first.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I have a simple geometry for a SPECT system:<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">SPECTHEAD<o:p></o:p></p>
<p class="MsoNormal">Lead shielding<o:p></o:p></p>
<p class="MsoNormal">Al cover under the crystal<o:p></o:p></p>
<p class="MsoNormal">Crystal<o:p></o:p></p>
<p class="MsoNormal">Back cover<o:p></o:p></p>
<p class="MsoNormal">No collimator (doing intrinsic tests).<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Source<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">The simulation runs fine.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">However, when I compare the energy spectrum from the simulation with an actual energy spectrum from the camera, I get very little low energy counts.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">So I cannot say that the simulation is a true reflection of the actual system.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Is this a known issue, or am I missing something.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks.<o:p></o:p></p>
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