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

[Jinxia Guo]

---------- 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
-------------- next part --------------
A non-text attachment was scrubbed...
Name: GATE6-COIN.png
Type: image/png
Size: 159250 bytes
Desc: not available
URL: <http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20110816/a22b6078/attachment-0001.png>