[Gate-users] Fwd: Error coincidence in GATE v6.1

[anwen long]

crystalID       = 2
 layerID         = 0
 comptonPhantom  = 0
 comptonCrystal  = 2
 RayleighPhantom = 0

Compton scatter may be the reason.
2011/8/16 Jinxia Guo <jinxia.guo2009 at gmail.com>

> ---------- Forwarded message ----------
> From: Jinxia Guo <jinxia.guo2009 at gmail.com>
> Date: 2011/8/15
> Subject: Error coincidence in GATE v6.1
> To: gate-users-request at lists.opengatecollaboration.org
>
>
> Dear Gate colleagues,
>
> I simulate a point source centered in a ring PET system. In the sinogram,
> there are many true coincidences whose two gamma photos have very larger
> intersection angle. As the attached file shows, I find there is true
> coincidence in LOR L when I use a point source placed in the center. There
> are similar coincidences in other LORs. Is there something wrong with GATE
> V6.1 or some setting is wrong in the simulation? Anyone knows? Thanks!
>
> Two singles information in a coincidence as an example:
>  ======> EVENT:5
>  runID           = 0
>  eventID         = 3
>  sourceID        = 0
>  sourcePosX      = 0
>  sourcePosY      = 0
>  sourcePosZ      = 0
>  time            = 1.88708e-08
>  energy          = 0.511
>  globalPosX      = 396.735
>  globalPosY      = -171.842
>  globalPosZ      = 0.00575761
>  gantryID        = 0
>  rsectorID       = 45
>  moduleID        = 0
>  submoduleID     = 0
>  crystalID       = 2
>  layerID         = 0
>  comptonPhantom  = 0
>  comptonCrystal  = 2
>  RayleighPhantom = 0
>  RayleighCrystal = 0
>  axialPos        = 0
>  rotationAngle   = 0
>  comptVolName    = NULL
>  RayleighVolName = NULL
>
>  ======> EVENT:6
>  runID           = 0
>  eventID         = 3
>  sourceID        = 0
>  sourcePosX      = 0
>  sourcePosY      = 0
>  sourcePosZ      = 0
>  time            = 1.88305e-08
>  energy          = 0.511
>  globalPosX      = -400.576
>  globalPosY      = -126.078
>  globalPosZ      = -0.359678
>  gantryID        = 0
>  rsectorID       = 26
>  moduleID        = 0
>  submoduleID     = 0
>  crystalID       = 6
>  layerID         = 0
>  comptonPhantom  = 0
>  comptonCrystal  = 0
>  RayleighPhantom = 0
>  RayleighCrystal = 0
>  axialPos        = 0
>  rotationAngle   = 0
>  comptVolName    = NULL
>  RayleighVolName = NULL
>
>
> Regards,
>
> --
> Jinxia Guo
> School of Life Sci&Tech
> D11 Building Room 503
> Huazhong Univ. of Sci. & Tech
> 1037 Luoyu Road, Wuhan 430074, China
> Tel:+86-27-8779-2294
>
>
>
> --
> Jinxia Guo
> School of Life Sci&Tech
> D11 Building Room 503
> Huazhong Univ. of Sci. & Tech
> 1037 Luoyu Road, Wuhan 430074, China
> Tel:+86-27-8779-2294
>
> _______________________________________________
> Gate-users mailing list
> Gate-users at lists.opengatecollaboration.org
> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
>