[Gate-users] Back-to-back gamma_ray

[Simon Stute]

Hi,

There was a known bug in gate_v6 but it was corrected in gate_v6.p01 (the
version inside vGate).
So it is strange you encounter some problem.
Could you please tell how do  you verify that "it radiated different angles,
it's not linear" ?

Simon

2010/6/5 Tsukahara Tatsuya <Tatsuya.Tsukahara at mc7.seikyou.ne.jp>

Hello dear Gate-Users,
>
> I have installed vGate. I'm trying to simulate of PET.
> Then, I have a problem concerning the gamma source.
> I defined set type as back-to-back, particle gamma, energy type Mono,
> but it radiated different angles, it's not linear.
> This is mac file of source ↓
>
> # S O U R C E 1
> /gate/source/addSource twogamma
> /gate/source/twogamma/setActivity 1000000. becquerel
> /gate/source/twogamma/gps/particle gamma
> /gate/source/twogamma/setType backtoback
> /gate/source/twogamma/gps/centre 0.0 0.0 0.0 mm
> /gate/source/twogamma/gps/energytype Mono
> /gate/source/twogamma/gps/monoenergy 0.511 MeV
> #/gate/source/twogamma/gps/type Point
> /gate/source/twogamma/gps/type Volume_
> /gate/source/twogamma/gps/shape Sphere
> #/gate/source/twogamma/gps/shape Cylinder
> /gate/source/twogamma/gps/radius 1. mm
> #/gate/source/twogamma/gps/halfz 20. mm
> /gate/source/twogamma/gps/angtype iso
> /gate/source/twogamma/gps/mintheta 0. deg
> /gate/source/twogamma/gps/maxtheta 180. deg
> /gate/source/twogamma/gps/minphi 0. deg
> /gate/source/twogamma/gps/maxphi 360. deg
>
> I am reading the user's guide but I don't really understand what
> parameter I should change...
> Please tell me some hints and solutions.
>
> Thanks a lot.
>
>
> Tatsuya Tsukahara
> Email_address : Tatsuya.Tsukahara at mc7.seikyou.ne.jp
>
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