[Gate-users] Regarding ct dosimetry with voxelized moving phantom

[Elnur Sadihov]

Hello,

I can advise following:
1) Try not to use container for phantom. For testing you should avoid extra
volumes. I think that container is not necessary here now.
2) In the block where you describe dose actor, you should set not only min
and max energies but the whole histogram. You can see the template of
histogram in exampleCT folder of GATE.
3) In the last block: I think that the total number of primaries should be
at least 1000 in order to see something. 10 particles is very low number.

Best regards,
Elnur

2017-01-05 17:32 GMT+03:00 Theodora Kostou <theokost at upatras.gr>:

> Hello,
>
> I am running Gate version 7.2 and I am trying to extract the dose from a
> moving phantom in order to simulate a CT scan.
>
> From the code below I can visualize the rotation of the xcat phantom but I
> take zero counts as output.
>
>
> /control/execute mac/verbose.mac
> #/control/execute mac/visu.mac
> /gate/geometry/setMaterialDatabase data/GateMaterials.db
> /gate/world/setMaterial Vacuum
> /gate/world/geometry/setXLength 1000. cm
> /gate/world/geometry/setYLength 1000. cm
> /gate/world/geometry/setZLength 1000. cm
> # Container to rotate the phantom
> /gate/world/daughters/name CT
> /gate/world/daughters/insert box
> /gate/CT/setMaterial Vacuum
> /gate/CT/geometry/setXLength 640. mm
> /gate/CT/geometry/setYLength 640. mm
> /gate/CT/geometry/setZLength 1825. mm
> /gate/CT/vis/forceWireframe
> /gate/CT/moves/insert rotation
> /gate/CT/rotation/setSpeed 45 deg/s
> /gate/CT/rotation/setAxis 0 0 1
> # Patient phantom (128x128x128 voxels, 5 mm voxelize)
> /gate/CT/daughters/name xcat
> /gate/CT/daughters/insert ImageRegularParametrisedVolume
> /gate/xcat/geometry/setImage data/xcat.h33
> /gate/xcat/geometry/setRangeToMaterialFile data/Range.dat
> /gate/xcat/geometry/TranslateTheImageAtThisIsoCenter 0 0 0 mm
> /gate/xcat/placement/setTranslation -320 -320 -912.5 mm
> #/gate/xcat/placement/setRotationAxis 1 0 0
> #/gate/xcat/placement/setRotationAngle 0 deg
> /gate/xcat/vis/forceWireframe
> #/gate/xcat/setSkipEqualMaterials 0
> /gate/CT/attachPhantomSD
> /gate/xcat/attachPhantomSD
>
> /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/addProcess Bremsstrahlung
> /gate/physics/processes/Bremsstrahlung/setModel StandardModel e-
> /gate/physics/addProcess MultipleScattering e-
> /gate/physics/processList Enabled
> /gate/physics/processList Initialized
>
> /gate/actor/addActor DoseActor doseDistribution
> /gate/actor/doseDistribution/save output/myactor.mhd
> /gate/actor/doseDistribution/attachTo xcat
> /gate/actor/doseDistribution/stepHitType random
> /gate/actor/doseDistribution/setPosition 0 0 0 mm
> /gate/actor/doseDistribution/setVoxelSize 5 5 5 mm
> /gate/actor/doseDistribution/enableEdep true
> /gate/actor/doseDistribution/enableUncertaintyEdep true
> /gate/actor/doseDistribution/enableDose true
> /gate/actor/doseDistribution/enableSquaredEdep false
> /gate/actor/doseDistribution/enableNumberOfHits false
> /gate/actor/doseDistribution/saveEveryNSeconds 10
>
> /gate/source/addSource xraygun gps
> /gate/source/xraygun/gps/verbose 1
> /gate/source/xraygun/gps/particle gamma
> /gate/source/xraygun/gps/energytype Arb
> /gate/source/xraygun/gps/histname arb
> /gate/source/xraygun/gps/emin 12.00 keV
> /gate/source/xraygun/gps/emax 120.00 keV
> /control/execute mac/histogram.mac
> /gate/source/xraygun/gps/arbint Lin
> /gate/source/xraygun/gps/type Plane
> /gate/source/xraygun/gps/shape Rectangle
> /gate/source/xraygun/gps/halfx 0.9 mm
> /gate/source/xraygun/gps/halfy 0.8 mm
> /gate/source/xraygun/gps/centre -60. 0. 0. cm
> /gate/source/xraygun/gps/angtype iso
> /gate/source/xraygun/gps/pos/rot1 1 0 0
> /gate/source/xraygun/gps/pos/rot2 0 1 0
> #cone angle
> /gate/source/xraygun/gps/mintheta 88.1 deg
> /gate/source/xraygun/gps/maxtheta 91.9 deg
> #fan angle
> /gate/source/xraygun/gps/minphi 155. deg
> /gate/source/xraygun/gps/maxphi 205.0 deg
> /gate/source/list
>
> /gate/run/initialize
> /gate/random/setEngineName MersenneTwister
> /gate/random/setEngineSeed auto
> /gate/application/setTimeStart 0 s
> /gate/application/setTimeStop 10. s
> /gate/application/setTimeSlice 1. s
> /gate/application/setTotalNumberOfPrimaries 10
> /gate/application/startDAQ
>
> Is something wrong or missing in the code?
>
> I would appreciate any kind of advice.
>
> Thank you
>
> Theodora
>
>
>
>
>
>
>
>
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