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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">I studied the Reference manual a little bit, and it appears that in the source code it acknowledged that this is a strange case, since the photonID vector
size is 1, instead of 0 or 2. If the positron escaped without annihilation, the photonID vector should be 0.
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Does this happen in earlier version of GATE at all (I am using version 3.1.2)?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Yi<o:p></o:p></span></p>
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color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> yuxuan.zhang@di.mdacc.tmc.edu [mailto:yuxuan.zhang@di.mdacc.tmc.edu]
<br>
<b>Sent:</b> Friday, January 04, 2008 3:44 PM<br>
<b>To:</b> Su, Yi<br>
<b>Cc:</b> 'gate-users@lists.healthgrid.org'; gate-users-bounces@lists.healthgrid.org<br>
<b>Subject:</b> Re: [Gate-users] GATE running problem--WARNING : positron found and photonID vector size 1<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Usually it is because that the size of your phantom is not big enough therefore some positron can escape from the phantom without</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">annihilation. If there are not a lot of warning messages, (less than a few per second) then that's fine. Otherwise you need to
</span><br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">check your phantom and source definition. The common error is that the part of the source is outside the phantom.</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">yuxuan</span> <br>
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<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">"Su, Yi" <suy@mir.wustl.edu></span></b>
<br>
<span style="font-size:7.5pt;font-family:"Arial","sans-serif"">Sent by: gate-users-bounces@lists.healthgrid.org</span>
<o:p></o:p></p>
<p><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">01/04/2008 01:31 PM</span>
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</span><br>
<span style="font-size:7.5pt;font-family:"Arial","sans-serif""> To: "'gate-users@lists.healthgrid.org'" <gate-users@lists.healthgrid.org></span>
<br>
<span style="font-size:7.5pt;font-family:"Arial","sans-serif""> cc: </span>
<br>
<span style="font-size:7.5pt;font-family:"Arial","sans-serif""> Subject: [Gate-users] GATE running problem--WARNING : positron found and photonID vector size 1</span><o:p></o:p></p>
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<span style="font-size:10.0pt">Hi there,</span> <br>
<span style="font-size:10.0pt"> </span> <br>
<span style="font-size:10.0pt">I am running a GATE simulation and the following warning message keeps popping up:</span>
<br>
<span style="font-size:10.0pt"> </span> <br>
<span style="font-size:10.0pt">[GateTrajectoryNavigator::FindAnnihilationGammasTrackID] WARNING : positron found and photonID vector size: 1</span>
<br>
<span style="font-size:10.0pt"> </span> <br>
<span style="font-size:10.0pt">Does anyone know what is going on, and what might be the problem? I am using Gate 3.1.2 and I am simulating an ecat system with a simple cylinder phantom and source.</span>
<br>
<span style="font-size:10.0pt"> </span> <br>
<span style="font-size:10.0pt">Thanks a lot,</span> <br>
<span style="font-size:10.0pt"> </span> <br>
<span style="font-size:10.0pt">Yi</span> <br>
<span style="font-size:10.0pt">__________________________________________</span> <br>
<span style="font-size:10.0pt">Yi Su, PhD</span> <br>
<span style="font-size:10.0pt">Division of Radiological Sciences</span> <br>
<span style="font-size:10.0pt">Mallinckrodt Institute of Radiology</span> <br>
<span style="font-size:10.0pt">Washington University School of Medicine</span> <br>
<span style="font-size:10.0pt">Campus Box 8225</span> <br>
<span style="font-size:10.0pt">510 S. Kingshighway Blvd</span> <br>
<span style="font-size:10.0pt">St. Louis MO 63110</span> <br>
<span style="font-size:10.0pt">Phone: 314-362-8363</span> <br>
<span style="font-size:10.0pt">Fax: 314-362-9940</span> <br>
<span style="font-size:10.0pt">Email: suy@mir.wustl.edu</span> <br>
<span style="font-size:10.0pt"> </span> <o:p></o:p></p>
<p><o:p> </o:p></p>
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