[Gate-users] S-values simulation

[Maria Inês Ribeiro]

Thank you so much.

It was supposed to be 100000 s. I just killed the simulation because it was
taking too long.
I swapped to the normal ion source definition since fastY90 can't be used
for dosimetry.

Do you recommend decreasing cut energy for photons and electrons?

Kind regards,
Maria

陈戈飞 <xiaofeizaina at 126.com> escreveu no dia terça, 9/02/2021 à(s) 15:13:

> Hi maria
> The total time of your simulations is 10000s，right?   If so, you only need
> to multiply by 1000(Gy->mGy) and divide 10000(time to 1s).
> And I recommend setting cut energy for beta and photon. Default is 10 mm.
> You'd better recheck the definition of fastY90. It can't be used for dose
> purposes.
> Thank you
>
>
> 陈戈飞
> 邮箱：xiaofeizaina at 126.com
>
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> 签名由 网易邮箱大师 <https://mail.163.com/dashi/dlpro.html?from=mail88> 定制
> On 02/09/2021 22:38, Maria Inês Ribeiro <mid.ribeiro at campus.fct.unl.pt>
> wrote:
>
> Hi everyone,
>
> I am attempting to compute a dose point kernel in soft tissue for a point
> source of Y90. I am using the fastY90 with an activity of 1 MBq.
> I then ran 40.000 slices of 1 second and stored the dose.
>
> My question is how do I convert my dose map (Gy) into the s values
> (mGy/(MBq.s)) for each voxel?
>
> Here is my could in case it could help to support my question:
>
>
> #===============================================================================
> # GEOMETRY
>
> #===============================================================================
>
> /gate/geometry/setMaterialDatabase                    data/GateMaterials.db
>
> #WORLD ======================================
> /gate/world/setMaterial                               Air
> /gate/world/geometry/setXLength                       50 mm
> /gate/world/geometry/setYLength                       50 mm
> /gate/world/geometry/setZLength                       50 mm
>
> #LIVER ======================================
> /gate/world/daughters/name                            liverPhantom
> /gate/world/daughters/insert                          box
> /gate/liverPhantom/setMaterial                        Liver
> /gate/liverPhantom/geometry/setXLength                24.31 mm
> /gate/liverPhantom/geometry/setYLength                24.31 mm
> /gate/liverPhantom/geometry/setZLength                24.31 mm
>
>
> #===============================================================================
> # PHYSICS
>
> #===============================================================================
>
> /gate/physics/addPhysicsList                          emstandard_opt3
>
>
> #===============================================================================
> # DETECTORS
>
> #===============================================================================
>
> #DOSE ACTOR ==============================
> #builds 3D images of:
> #   - the energy deposited (edep in MeV)
> #   - dose deposited (Gy)
> #   - the number of hits in a  volume
>
> /gate/actor/addActor                                  DoseActor  VSV
> /gate/actor/VSV/attachTo                          liverPhantom
> /gate/actor/VSV/stepHitType                           random
> /gate/actor/VSV/setSize                               24.31 24.31 24.31 mm
> /gate/actor/VSV/setPosition                           0 0 0 cm
> /gate/actor/VSV/setResolution                         11 11 11
> /gate/actor/VSV/enableEdep                            true
> /gate/actor/VSV/enableUncertaintyEdep                 true
> /gate/actor/VSV/enableSquaredEdep                     true
> /gate/actor/VSV/enableDose                            true
> /gate/actor/VSV/enableUncertaintyDose                 true
> /gate/actor/VSV/enableSquaredDose                     true
> /gate/actor/VSV/enableNumberOfHits                    true
> /gate/actor/VSV/save                                  output/VSV.mhd
>
> #SIMULATION STATISTIC =====================
> #this actos counts the number of steps, tracks, events, runs in the
> simulation
>
> /gate/actor/addActor
> SimulationStatisticActor stat
> /gate/actor/stat/save                              output/stat-VSV.txt
> /gate/actor/stat/saveEveryNSeconds                 60
>
>
>
> #===============================================================================
> # INITIALISATION
>
> #===============================================================================
>
> /gate/run/initialize
>
> /gate/random/setEngineName MersenneTwister
> /gate/random/setEngineSeed auto
>
> #===========================================================
> # SOURCE
> #===========================================================
>
> # fastY90
> /gate/source/addSource                                 y90 fastY90
> /gate/source/y90/setActivity                           1.  MBq
>
> #=====================================================
> # START
> #=====================================================
>
> /gate/application/setTimeSlice                         1. s
> /gate/application/setTimeStart                         0. s
> /gate/application/setTimeStop                          1000000. s
>
> /gate/application/start
>
>
> Thanks a lot for your attention,
>
> Maria Inês
>
>
>
>
>
>
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