<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> </head> <body bgcolor="#FFFFFF"> <div class="moz-cite-prefix">Dear Konstantinos, yes, we have have also had this problem before in our group. There seems to be a problem with the regularMatrix navigator in Gate v6.2. If I remember correctly it worked with our installation of Gate v6.1. Of course the problem might also arise from the different underlying Geant4 versions, I'm not sure about that. What you could do is switch to a different navigator, e.g. compressedMatrix. This will be a bit slower though. Hope this helps. Best regards, Michaela On 04/03/2014 09:59 AM, Constantine Mountris wrote: </div> <blockquote type="cite"> <div style="color:#000; background-color:#fff; font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; font-size:12pt"> <div>Hello Gate-Users,</div> <div style="color:rgb(0,0,0); font-size:16px; font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color:transparent; font-style:normal"> I am using the XCAT phantom to simulate some PET and SPECT studies of activity uptake in the liver and in a spherical tumour located in the liver. There is no activity in the rest of my phantom. </div> <div style="color:rgb(0,0,0); font-size:16px; font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color:transparent; font-style:normal"> I have used the command attachVoxelSD to my phantom, but in my simulation the scatter photons are extremely low around 3% and it's not seem normal. </div> <div style="color:rgb(0,0,0); font-size:16px; font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color:transparent; font-style:normal"> </div> <div style="color:rgb(0,0,0); font-size:16px; font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color:transparent; font-style:normal"> Had anyone come up with this problem in the past?</div> <div style="color:rgb(0,0,0); font-size:16px; font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color:transparent; font-style:normal"> Any advices would be well accepted. Thank you in advance.</div> <div style="color:rgb(0,0,0); font-size:16px; font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color:transparent; font-style:normal"> </div> <div style="color:rgb(0,0,0); font-size:16px; font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color:transparent; font-style:normal"> This is part of my .mac : </div> <div style="color:rgb(0,0,0); font-size:16px; font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color:transparent; font-style:normal"> </div> <div style="color:rgb(0,0,0); font-size:16px; font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color:transparent; font-style:normal"> #=================================================== # PHANTOM #=================================================== /gate/world/daughters/name youri /gate/world/daughters/insert regularMatrix /gate/youri/geometry/insertReader interfile /gate/youri/interfileReader/insertTranslator range /gate/youri/interfileReader/rangeTranslator/readTable ../data/attenuation.dat /gate/youri/interfileReader/rangeTranslator/describe 1 /gate/youri/interfileReader/readFile ../data/youri_cancered_atn_1.h33 /gate/youri/placement/setRotationAxis 1 0 0 /gate/youri/placement/setRotationAngle 0 deg /gate/youri/placement/setTranslation 0. 0. -18. mm /gate/youri/attachVoxelPhantomSD</div> <div style="color:rgb(0,0,0); font-size:16px; font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color:transparent; font-style:normal"> </div> <div style="color:rgb(0,0,0); font-size:16px; font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color:transparent; font-style:normal"> #======================================= # VOXELIZED SOURCES #======================================= </div> <div style="color:rgb(0,0,0); font-size:16px; font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color:transparent; font-style:normal"> /gate/source/addSource GaMAA voxel /gate/source/GaMAA/reader/insert interfile /gate/source/GaMAA/interfileReader/translator/insert range /gate/source/GaMAA/interfileReader/rangeTranslator/readTable ../data/activityTCMAA.dat /gate/source/GaMAA/interfileReader/rangeTranslator/describe 1 /gate/source/GaMAA/interfileReader/readFile ../data/youri_cancered_atn_1.h33 /gate/source/GaMAA/gps/particle ion /gate/source/GaMAA/gps/ion 31 68 0 0 /gate/source/GaMAA/gps/energytype Mono /gate/source/GaMAA/gps/monoenergy 0. eV /gate/source/GaMAA/setForcedUnstableFlag true /gate/source/GaMAA/useDefaultHalfLife /gate/source/GaMAA/setPosition -192.0 -192.0 -304.5 mm /gate/source/GaMAA/gps/angtype iso /gate/source/GaMAA/gps/confine NULL /gate/source/GaMAA/dump 1 /gate/source/list </div> <div style="color:rgb(0,0,0); font-size:16px; font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color:transparent; font-style:normal"> </div> <div style="color:rgb(0,0,0); font-size:16px; font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color:transparent; font-style:normal"> </div> Best regards, Konstantinos Mountris. <div> </div> <div> ---- <a class="moz-txt-link-freetext" href="http://about.me/constantine.mountris">http://about.me/constantine.mountris</a> :. </div> </div> <fieldset class="mimeAttachmentHeader"></fieldset> <pre>_______________________________________________ Gate-users mailing list <a class="moz-txt-link-abbreviated" href="mailto:Gate-users@lists.opengatecollaboration.org">Gate-users@lists.opengatecollaboration.org</a> <a class="moz-txt-link-freetext" href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users">http://lists.opengatecollaboration.org/mailman/listinfo/gate-users</a></pre> </blockquote> ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. 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