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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Thanks a lot for the information. So exactly what triggers the warning message, when the positron escapes the ‘world’ or the phantom volume? Would these positrons
interact with the detector and messing up the simulation? Right now I am seeing a couple of such warning messages per second.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Another question is if we are simulating a mouse PET scan using voxelized phantom/source, I assume the same volume is phantom and source at the same time,
would this cause more such warning messages?<o:p></o:p></span></p>
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color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Thanks again.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Yi<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
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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<o:p></o:p></p>
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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>
<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">
</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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