[Gate-users] Energy cut off vaules for a voxelised PET simulation to reduce computational time

[Gottwald, Jennifer]

Dear GATE users,

I would like to speed up my voxelised PET simulation with the help of energy cut off values.

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.

Problem:
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?

GATE 7.2 , Ram 7.8GB, on local disk, 1Core, CPU 2000.000 MHz.


I used the following physics and source details:



Physics:

/gate/physics/addPhysicsList    emstandard
/gate/physics/addProcess PhotoElectric
/gate/physics/processes/PhotoElectric/setModel StandardModel

/gate/physics/addProcess Compton
/gate/physics/processes/Compton/setModel StandardModel

/gate/physics/addProcess RayleighScattering
/gate/physics/processes/RayleighScattering/setModel PenelopeModel

/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 eMultipleScattering
/gate/physics/processes/eMultipleScattering/setGeometricalStepLimiterType e- distanceToBoundary
/gate/physics/processes/eMultipleScattering/setGeometricalStepLimiterType e+ distanceToBoundary
/gate/physics/processes/eMultipleScattering/setModel UrbanModel

# Cuts for particle in world

/gate/physics/Gamma/SetCutInRegion      world 650.0 mm
/gate/physics/Electron/SetCutInRegion   world 1000.0 mm


/gate/physics/processList Enabled

/gate/physics/processList Initialized

/gate/physics/displayCuts

/gate/physics/print PHYSICS



Source:

/gate/source/Patient6source/reader/insert interfile
/gate/source/Patient6source/interfileReader/translator/insert range
/gate/source/Patient6source/interfileReader/rangeTranslator/readTable data/Voxel_Source_Table.dat
/gate/source/Patient6source/interfileReader/rangeTranslator/describe 1
/gate/source/Patient6source/interfileReader/readFile data/Cylinder_activity.h33
/gate/source/Patient6source/setType backtoback
/gate/source/Patient6source/setPosition -250 -250 -58.75 mm


/gate/source/Patient6source/gps/particle e+
/gate/source/Patient6source/setForcedUnstableFlag true
/gate/source/Patient6source/setForcedHalfLife 6586.2 s
/gate/source/Patient6source/gps/energytype Fluor18
/gate/source/Patient6source/gps/angtype iso
/gate/source/Patient6source/dump 1


/gate/source/list

Thank you very much for your help!

Jennifer Gottwald


This e-mail may contain confidential and/or privileged information for the sole use of the intended recipient. 
Any review or distribution by anyone other than the person for whom it was originally intended is strictly prohibited. 
If you have received this e-mail in error, please contact the sender and delete all copies. 
Opinions, conclusions or other information contained in this e-mail may not be that of the organization.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20170117/f57a17d5/attachment.html>