[Gate-users] Re : How to detect some sources ?

[Alexandre Dupas]

Hi Tatsuya,

If you are using a recent version of vGate (i.e. the Gate6 version),
the issue will not be the one Samuel explained. The bug we encountered
in Gate5 has been corrected in Gate6.

If you need it, here is the command used to parameter the
accolinearity of a source.

/gate/source/NAME/setAccolinearityFlag false
/gate/source/NAME/setAccoValue 0.5 deg

Regards,
Alexandre

--
Alexandre Dupas
Postdoctoral Researcher Fellow
INSERM U698, Bichat Médecine Nucléaire

2010/10/21 Samuel BURG <samuel_burg at yahoo.fr>:
> Hi,
>
> There is an error with the backtoback initialization.
> If you do not force any angle the value is "not defined" (i.e. not initilized in
> the C/C++ code) and so sometime you have something in the source, sometime
> nothing because of a stupid angle ...
> we have found and explane this bug a few days ago (yesterday in fact !) with
> Simon Stute and Alexandre Dupas.
> a bug fix is in progress.
>
> for now the best way is to setup any logical value for the angle
> (non-collinearity) of the backtoback process.
>
> best regards,
>
>  Samuel Burg
>
>
> CHU Bichat Claude Bernard
> 75018 Paris
>
>
>
>
> ________________________________
> De : Tsukahara Tatsuya <Tatsuya.Tsukahara at mc7.seikyou.ne.jp>
> À : gate-users at lists.opengatecollaboration.org
> Envoyé le : Jeu 21 octobre 2010, 6h 31min 07s
> Objet : [Gate-users] How to detect some sources ?
>
> Hello dear Gate-Users,
>
> I have installed vGate. And I'm trying to simulate of PET.
> I set some sources in the world. I show this code of sources below.
> Then, I detected only SOURCE1 and SOURCE3. SOURCE2 wasn't detected.
> I tried some patterns of geometry, but I couldn't detect all sources.
> I am reading the user's guide but I don't understand what parameter I
> should change...
> Please tell me some hints and solutions.
>
> Thanks a lot.
>
> Tatsuya Tsukahara
>
>
> ======================================================
>
> #    S O U R C E 1
> /gate/source/addSource twogamma
> /gate/source/twogamma/setActivity 30000000. 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 25. mm
> #/gate/source/twogamma/gps/halfz 20. mm
> #/gate/source/twogamma/gps/confine NULL
> /gate/source/twogamma/gps/angtype iso
> /gate/source/twogamma/gps/mintheta 90. deg
> /gate/source/twogamma/gps/maxtheta 90. deg
> /gate/source/twogamma/gps/minphi 0. deg
> /gate/source/twogamma/gps/maxphi 360. deg
> /gate/source/list
>
> #    S O U R C E 2
> /gate/source/addSource twogamma2
> /gate/source/twogamma2/setActivity 10000000. becquerel
> /gate/source/twogamma2/gps/particle gamma
> /gate/source/twogamma2/setType backtoback
> /gate/source/twogamma2/gps/centre 10.0 10.0 0.0 mm
> /gate/source/twogamma2/gps/energytype Mono
> /gate/source/twogamma2/gps/monoenergy 0.511 MeV
> #/gate/source/twogamma2/gps/type Point
> /gate/source/twogamma2/gps/type Volume
> /gate/source/twogamma2/gps/shape Sphere
> #/gate/source/twogamma2/gps/shape Cylinder
> /gate/source/twogamma2/gps/radius 5. mm
> #/gate/source/twogamma2/gps/halfz 20. mm
> #/gate/source/twogamma2/gps/confine NULL
> /gate/source/twogamma2/gps/angtype iso
> /gate/source/twogamma2/gps/mintheta 90. deg
> /gate/source/twogamma2/gps/maxtheta 90. deg
> /gate/source/twogamma2/gps/minphi 0. deg
> /gate/source/twogamma2/gps/maxphi 360. deg
> /gate/source/list
>
> #    S O U R C E 3
> /gate/source/addSource twogamma3
> /gate/source/twogamma3/setActivity 10000000. becquerel
> /gate/source/twogamma3/gps/particle gamma
> /gate/source/twogamma3/setType backtoback
> /gate/source/twogamma3/gps/centre -20.0 0.0 0.0 mm
> /gate/source/twogamma3/gps/energytype Mono
> /gate/source/twogamma3/gps/monoenergy 0.511 MeV
> #/gate/source/twogamma3/gps/type Point
> /gate/source/twogamma3/gps/type Volume
> /gate/source/twogamma3/gps/shape Sphere
> #/gate/source/twogamma3/gps/shape Cylinder
> /gate/source/twogamma3/gps/radius 5. mm
> #/gate/source/twogamma3/gps/halfz 20. mm
> #/gate/source/twogamma3/gps/confine NULL
> /gate/source/twogamma3/gps/angtype iso
> /gate/source/twogamma3/gps/mintheta 90. deg
> /gate/source/twogamma3/gps/maxtheta 90. deg
> /gate/source/twogamma3/gps/minphi 0. deg
> /gate/source/twogamma3/gps/maxphi 360. deg
> /gate/source/list
>
>
>
>
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