<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 again, I have determined my problem with the coincidence window command. The /gate/digitizer/Coincidences branch is not available until the proper system has been defined. I was attempting to simulate a two-plate PET scan, but had my system defined with systemType scanner. I just created a cylinder volume and used a ring repeater, but repeated the ring twice. Once I changed my systemType to cylindricalPET and attached the daughter volumes as required, I was able to set the coincidence window. I'm still curious about my crosstalk question I posted previously, though. Now I have a different issue. When reading the root files, the leaves in the Hits and Singles branches are all filled, but my leaves for my Coincidences and delay branches are all empty. I can't figure out why. When I run the benchPET macro and PET example macro, it's all there. I am simulating two plates of LYSO crystals with a point source of backtoback 511keV gamma rays. I made the emission angles of the source to be concentrated over the plates. I know this works because I'm getting plenty of entries in my Hits and Singles output branches. It's just the Coincidence and delay that I'm having trouble with. I made my phantom a sphere of water for now. Here is my code so far: ### databases /gate/geometry/setMaterialDatabase /home/djvanel/GateMaterials.db /gate/physics/addPhysicsList QGSP_BERT_EMV ### world /gate/world/geometry/setXLength 100. cm /gate/world/geometry/setYLength 100. cm /gate/world/geometry/setZLength 100. cm /gate/world/setMaterial Air ### visual /vis/open OGLSX /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 15 30 /vis/scene/add/axes #/tracking/storeTrajectory 1 #/vis/scene/add/trajectories /vis/scene/endOfEventAction accumulate #/vis/viewer/zoom 1.5 /gate/world/vis/setVisible false ### cylinder /gate/world/daughters/name cylindricalPET #/gate/world/daughters/systemType cylindricalPET /gate/world/daughters/insert cylinder /gate/cylindricalPET/setMaterial Air /gate/cylindricalPET/geometry/setRmin 6. cm /gate/cylindricalPET/geometry/setRmax 15. cm /gate/cylindricalPET/geometry/setHeight 25. cm /gate/cylindricalPET/vis/forceWireframe /gate/cylindricalPET/vis/setColor white /gate/geometry/rebuild ### board /gate/cylindricalPET/daughters/name board /gate/cylindricalPET/daughters/insert box /gate/board/geometry/setXLength 2. cm /gate/board/geometry/setYLength 20. cm /gate/board/geometry/setZLength 20. cm /gate/board/vis/forceWireframe /gate/board/vis/setColor white /gate/board/placement/setTranslation 10. 0. 0. cm /gate/geometry/rebuild ### box1 /gate/board/daughters/name box1 /gate/board/daughters/insert box /gate/box1/geometry/setXLength 2. cm /gate/box1/geometry/setYLength 5. cm /gate/box1/geometry/setZLength 5. cm /gate/box1/setMaterial Air /gate/box1/vis/forceWireframe /gate/box1/vis/setColor red /gate/geometry/rebuild ### pixel /gate/box1/daughters/name pixel /gate/box1/daughters/insert box /gate/pixel/geometry/setXLength 2. cm /gate/pixel/geometry/setYLength 1. cm /gate/pixel/geometry/setZLength 1. cm /gate/pixel/setMaterial Air /gate/pixel/vis/forceWireframe /gate/pixel/vis/setColor red /gate/geometry/rebuild ### crystal /gate/pixel/daughters/name crystal /gate/pixel/daughters/insert box /gate/crystal/geometry/setXLength 2. cm /gate/crystal/geometry/setYLength 1. cm /gate/crystal/geometry/setZLength 1. cm /gate/crystal/setMaterial LYSO /gate/crystal/vis/forceSolid /gate/crystal/vis/setColor green /gate/geometry/rebuild ### repeat pixel /gate/pixel/repeaters/insert cubicArray /gate/pixel/cubicArray/setRepeatNumberY 5 /gate/pixel/cubicArray/setRepeatNumberZ 5 /gate/pixel/cubicArray/setRepeatVector 0. 1. 1. cm /gate/geometry/rebuild ### repeat box /gate/box1/repeaters/insert cubicArray /gate/box1/cubicArray/setRepeatNumberY 4 /gate/box1/cubicArray/setRepeatNumberZ 4 /gate/box1/cubicArray/setRepeatVector 0. 5. 5. cm /gate/geometry/rebuild ### repeat board /gate/board/repeaters/insert ring /gate/board/ring/setRepeatNumber 2 ### phantom /gate/world/daughters/name phantom /gate/world/daughters/insert sphere /gate/phantom/geometry/setRmin 0. cm /gate/phantom/geometry/setRmax 3. cm /gate/phantom/setMaterial Water /gate/phantom/vis/forceSolid /gate/phantom/vis/setColor blue /gate/geometry/rebuild ### system /gate/systems/cylindricalPET/rsector/attach board /gate/systems/cylindricalPET/module/attach box1 /gate/systems/cylindricalPET/crystal/attach pixel /gate/systems/cylindricalPET/layer0/attach crystal /gate/systems/cylindricalPET/describe ### attach layer SD /gate/phantom/attachPhantomSD /gate/crystal/attachCrystalSD ### physics /gate/physics/addProcess PhotoElectric /gate/physics/processes/PhotoElectric/setModel StandardModel /gate/physics/addProcess Compton /gate/physics/processes/Compton/setModel StandardModel /gate/physics/addProcess RayleighScattering gamma /gate/physics/processes/RayleighScattering/setModel PenelopeModel /gate/physics/addProcess GammaConversion /gate/physics/processes/GammaConversion/setModel StandardModel /gate/physics/addProcess ElectronIonisation /gate/physics/processes/ElectronIonisation/setModel StandardModel e- /gate/physics/processes/ElectronIonisation/setModel StandardModel e+ /gate/physics/addProcess Bremsstrahlung /gate/physics/processes/Bremsstrahlung/setModel StandardModel e- /gate/physics/processes/Bremsstrahlung/setModel StandardModel e+ /gate/physics/addProcess PositronAnnihilation /gate/physics/addProcess RadioactiveDecay /gate/physics/addProcess eMultipleScattering /gate/physics/processes/eMultipleScattering/setGeometricalStepLimiterType e- distanceToBoundary /gate/physics/processes/eMultipleScattering/setGeometricalStepLimiterType e+ distanceToBoundary /gate/physics/processList Enabled /gate/physics/processList Initialized ### cut in regions #/gate/physics/Gamma/SetCutInRegion world 10. cm #/gate/physics/Gamma/SetCutInRegion phantom 5. mm #/gate/physics/SetMaxStepSizeInRegion phantom 5. mm ### initialization /gate/run/initialize ### digitizer /gate/digitizer/Singles/insert adder /gate/digitizer/Singles/insert readout /gate/digitizer/Singles/readout/setPolicy TakeEnergyWinner /gate/digitizer/Singles/readout/setDepth 1 /gate/digitizer/Singles/insert crystalblurring /gate/digitizer/Singles/crystalblurring/setCrystalResolutionMin 0.15 /gate/digitizer/Singles/crystalblurring/setCrystalResolutionMax 0.35 /gate/digitizer/Singles/crystalblurring/setCrystalQE 0.9 /gate/digitizer/Singles/crystalblurring/setCrystalEnergyOfReference 511. keV /gate/digitizer/Singles/insert thresholder /gate/digitizer/Singles/thresholder/setThreshold 0. keV /gate/digitizer/Singles/insert upholder /gate/digitizer/Singles/upholder/setUphold 750. keV /gate/digitizer/Coincidences/setWindow 50. ns /gate/digitizer/Coincidences/minSectorDifference 2 /gate/digitizer/Coincidences/MultiplesPolicy takeWinnerOfGoods /gate/digitizer/name delay /gate/digitizer/insert coincidenceSorter /gate/digitizer/delay/setWindow 50. ns /gate/digitizer/delay/setOffset 500. ns /gate/digitizer/delay/MultiplesPolicy takeWinnerOfGoods /gate/digitizer/delay/setDepth 1 ### source /gate/source/addSource Gamma /gate/source/Gamma/gps/centre 0. 0. 0. cm /gate/source/Gamma/setActivity 100000. becquerel /gate/source/Gamma/gps/particle gamma /gate/source/Gamma/setType backtoback /gate/source/Gamma/gps/energytype Mono /gate/source/Gamma/gps/monoenergy 511. keV /gate/source/Gamma/setForcedUnstableFlag true /gate/source/Gamma/setForcedHalfLife 1000 s /gate/source/Gamma/gps/angtype iso /gate/source/Gamma/gps/mintheta 60. deg /gate/source/Gamma/gps/maxtheta 120. deg /gate/source/Gamma/gps/minphi 120. deg /gate/source/Gamma/gps/maxphi 240. deg ### output /gate/output/root/enable /gate/output/root/setFileName dualplate /gate/output/root/setRootHitFlag 1 /gate/output/root/setRootSinglesFlag 1 /gate/output/root/setRootNtupleFlag 1 /gate/output/root/setRootCoincidencesFlag 1 /gate/output/root/setRootdelayFlag 1 ### random # JamesRandom Ranlux64 MersenneTwister /gate/random/setEngineName MersenneTwister #/gate/random/setEngineSeed default #/gate/random/setEngineSeed auto /gate/random/setEngineSeed 123456789 #/gate/random/resetEngineFrom fileName /gate/random/verbose 0 ### simulation length /gate/application/setTimeSlice 1 s /gate/application/setTimeStart 0. s /gate/application/setTimeStop 10 s Any help is appreciated! Thank you Devin Van Elburg --------------- Physics w/ c/ Biomedical Physics Lakehead University </body></html>