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<p class="MsoNormal">Dear GATE users,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>I would like to speed up my voxelised PET simulation with the help of energy cut off values.
<o:p></o:p></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I would like to set an energy cut off for my photons (no photon simulation if the energy is below 425 keV ) and for all secondary particles such as electrons so high that they won’t simulated at all.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>Problem: <o:p></o:p></b></p>
<p class="MsoNormal">My simulation doesn’t speed up or either I get more detector entries. When I set the photon cut off to more than 511keV I still get entries in my detector and have the same simulation time. How can I implement my cut off values correctly
for a voxelized source and material phantom?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">GATE 7.2 , Ram 7.8GB, on local disk, 1Core, CPU 2000.000 MHz.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><o:p> </o:p></b></p>
<p class="MsoNormal"><b>I used the following physics and source details:<o:p></o:p></b></p>
<p class="MsoPlainText" style="margin-bottom:12.0pt"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoPlainText" style="margin-bottom:12.0pt"><b><span style="font-family:"Courier New"">Physics:</span></b><span style="font-family:"Courier New""><br>
<br>
/gate/physics/addPhysicsList emstandard<br>
/gate/physics/addProcess PhotoElectric<br>
/gate/physics/processes/PhotoElectric/setModel StandardModel<br>
<br>
/gate/physics/addProcess Compton<br>
/gate/physics/processes/Compton/setModel StandardModel<br>
<br>
/gate/physics/addProcess RayleighScattering<br>
/gate/physics/processes/RayleighScattering/setModel PenelopeModel<br>
<br>
/gate/physics/addProcess ElectronIonisation<br>
/gate/physics/processes/ElectronIonisation/setModel StandardModel e-<br>
/gate/physics/processes/ElectronIonisation/setModel StandardModel e+<br>
<br>
/gate/physics/addProcess Bremsstrahlung<br>
/gate/physics/processes/Bremsstrahlung/setModel StandardModel e-<br>
/gate/physics/processes/Bremsstrahlung/setModel StandardModel e+<br>
<br>
/gate/physics/addProcess PositronAnnihilation<br>
<br>
/gate/physics/addProcess eMultipleScattering<br>
/gate/physics/processes/eMultipleScattering/setGeometricalStepLimiterType e- distanceToBoundary<br>
/gate/physics/processes/eMultipleScattering/setGeometricalStepLimiterType e+ distanceToBoundary<br>
/gate/physics/processes/eMultipleScattering/setModel UrbanModel<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Courier New";color:red"># Cuts for particle in world<br>
<br>
/gate/physics/Gamma/SetCutInRegion world 650.0 mm<br>
/gate/physics/Electron/SetCutInRegion world 1000.0 mm</span><span style="font-family:"Courier New""><br>
<br>
<br>
/gate/physics/processList Enabled<br>
<br>
/gate/physics/processList Initialized<br>
<br>
/gate/physics/displayCuts<br>
<br>
/gate/physics/print PHYSICS</span><span style="font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal"><b><o:p> </o:p></b></p>
<p class="MsoNormal"><b><o:p> </o:p></b></p>
<p class="MsoNormal"><b><o:p> </o:p></b></p>
<p class="MsoNormal"><b>Source:<o:p></o:p></b></p>
<p class="MsoPlainText"><span style="font-family:"Courier New"">/gate/source/Patient6source/reader/insert interfile<br>
/gate/source/Patient6source/interfileReader/translator/insert range<br>
/gate/source/Patient6source/interfileReader/rangeTranslator/readTable data/Voxel_Source_Table.dat<br>
/gate/source/Patient6source/interfileReader/rangeTranslator/describe 1<br>
/gate/source/Patient6source/interfileReader/readFile data/Cylinder_activity.h33<br>
/gate/source/Patient6source/setType backtoback<br>
/gate/source/Patient6source/setPosition -250 -250 -58.75 mm<br>
<br>
<br>
/gate/source/Patient6source/gps/particle e+<br>
/gate/source/Patient6source/setForcedUnstableFlag true<br>
/gate/source/Patient6source/setForcedHalfLife 6586.2 s<br>
/gate/source/Patient6source/gps/energytype Fluor18<br>
/gate/source/Patient6source/gps/angtype iso<br>
/gate/source/Patient6source/dump 1<br>
<br>
<br>
/gate/source/list</span><o:p></o:p></p>
<p class="MsoNormal"><b><o:p> </o:p></b></p>
<p class="MsoNormal">Thank you very much for your help!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Jennifer Gottwald<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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