[Gate-users] Back-to-back gamma_ray

[Tsukahara Tatsuya]

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