<html><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><META name="Author" content="Novell GroupWise WebAccess"></head><body style='font-family: Tahoma, sans-serif; font-size: 13px; '>Hello Marc, <br><br>I'll try and explain a little better what I'm trying to do. I have defined my system as a PETscanner and attached the daughter volumes as follows:<br><br>/gate/systems/PETscanner/level1/attach headblock<br>/gate/systems/PETscanner/level2/attach crystalboard<br>/gate/systems/PETscanner/level3/attach crystal<br>/gate/systems/PETscanner/layer0/attach lyso<br>/gate/lyso/attachCrystalSD<br><br>where 'crystal' is repeated as a cubicArray (24x24) and 'headblock' is repeated twice with a ring repeater. I now have two opposing lyso crystals with the attached CrystalSD. When using the default readout policy:<br><br>/gate/digitizer/Singles/readout/setPolicy TakeEnergyWinner<br><br>My simulation runs fine, and the root output I receive is expected (511keV peak as I am using a Na-22 source for positron annihilation) for both Singles and Coincidences. However, when I try:<br><br>/gate/digitizer/Singles/readout/setPolicy TakeEnergyCentroid<br><br>I get a break with the following message:<br><br>[systems/PETscanner::FindComponent]:<br> Could not find the request system component 'crystal'!<br><br>-------- EEEE ------- G4Exception-START -------- EEEE -------<br>*** G4Exception : ProcessPulseList<br> issued by : GateReadout::ProcessPulseList<br>Failed to get the array component corresponding to the crystal. Abort.<br><br>*** Fatal Exception *** core dump ***<br>-------- EEEE -------- G4Exception-END --------- EEEE -------<br><br><br>*** G4Exception: Aborting execution ***<br>Aborted (core dumped)<br><br><br>What I take from this is that I need to use a system that I can attach a volume to a so-called 'crystal' level. I've been playing with cylindricalPET and redefined my system as follows:<br><br>/gate/systems/cylindricalPET/rsector/attach headblock<br>/gate/systems/cylindricalPET/module/attach crystalboard<br>/gate/systems/cylindricalPET/crystal/attach crystal<br>/gate/systems/cylindricalPET/layer0/attach lyso<br>/gate/lyso/attachCrystalSD<br><br>that way, I have attached my 'crystal' volume to a 'crystal' level in the system hierarchy as I assume the error message suggested. Even still, I get the break segmentation violation. I also get the same error when switching to TakeEnergyCentroid for the cylindricalPET example that GATE supplies. The wiki says to ensure the Depth is taken just above the crystal, which I did. In fact I tried running it with the depth at all levels and they all failed. I'm at a loss, I can't seem to get the TakeEnergyCentroid policy to work despite my best efforts!<br><br>By the way, ignore my comment with my previous email concerning the number of plates with a ring repeater. That was a readout depth issue and it's working now.<br><br>I'd appreciate any help I can get here!<br><br>Regards,<br>Devin Van Elburg<br><br>------------------------<br class=""> Physics w/ c/ Biomedical Physics<br class=""> Lakehead University<br><br><br><br><br>>>> Marc Chamberland <marcchamberland@cmail.carleton.ca> 06/02/15 5:00 PM >>><br> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> Hi Devin, <div class=""><br class=""> </div> <div class="">I’m not sure I understand what you’re trying to do and what failed to work. Can you provide more details?</div> <div class=""><br class=""> </div> <div class="">Also, did you attach a crystalSD to your plates, as outlined here: <a href="http://wiki.opengatecollaboration.org/index.php/Users_Guide_V7.1:Attaching_the_sensitive_detectors#The_crystalSD" class="">http://wiki.opengatecollaboration.org/index.php/Users_Guide_V7.1:Attaching_the_sensitive_detectors#The_crystalSD</a></div> <div class=""><br class=""> </div> <div class="">Cheers,<br class=""> <div class="">Marc<br class=""> <br class=""> <br class=""> <br class=""> __________________________<br class=""> <br class=""> Marc Chamberland, PhD<br class=""> Department of Physics<br class=""> Carleton University<br class=""> Ottawa (ON) </div> <br class=""> <div> <blockquote type="cite" class=""> <div class="">On Jun 2, 2015, at 16:49, Devin VanElburg <<a href="mailto:vanelbud@tbh.net" class="">vanelbud@tbh.net</a>> wrote:</div> <br class="Apple-interchange-newline"> <div class=""> <meta name="Author" content="Novell GroupWise WebAccess" class=""> <div style="font-family: Tahoma, sans-serif; font-size: 13px; " class="">Hello gate users,<br class=""> <br class=""> I am simulating a PET system with two plates. I would like to use the takeEnergyCentroid option for the digitizer's readout. However, I need to attach a volume to a 'crystal' of a system (according to the error message I keep getting). Thus a PETscanner system cannot work since it uses level1-4 and layers for system attachment. The I tried a cylindricalPET system with a ring repeater of 2, and that also didn't work. Interestingly, cylindricalPET works for a 4+ plate ring system, but no singles or coincidences in the output for 2-3 plates (with only the ring repeat number changed). Can anyone offer any insight as to what I should do?<br class=""> <br class=""> Regards,<br class=""> Devin Van Elburg<br class=""> <br class=""> ------------------------<br class=""> Physics w/ c/ Biomedical Physics<br class=""> Lakehead University<br class=""> </div> _______________________________________________<br class=""> Gate-users mailing list<br class=""> <a href="mailto:Gate-users@lists.opengatecollaboration.org" class="">Gate-users@lists.opengatecollaboration.org</a><br class=""> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users</div> </blockquote> </div> <br class=""> </div> </marcchamberland@cmail.carleton.ca></body></html>