[Gate-users] GATE running problem--WARNING : positron found and photonID vector size 1

[Su, Yi]

I studied the Reference manual a little bit, and it appears that in the source code it acknowledged that this is a strange case, since the photonID vector size is 1, instead of 0 or 2. If the positron escaped without annihilation, the photonID vector should be 0.

Does this happen in earlier version of GATE at all (I am using version 3.1.2)?

Yi

From: yuxuan.zhang at di.mdacc.tmc.edu [mailto:yuxuan.zhang at di.mdacc.tmc.edu]
Sent: Friday, January 04, 2008 3:44 PM
To: Su, Yi
Cc: 'gate-users at lists.healthgrid.org'; gate-users-bounces at lists.healthgrid.org
Subject: Re: [Gate-users] GATE running problem--WARNING : positron found and photonID vector size 1


Usually it is because that the size of your phantom is not big enough therefore some positron can escape from the phantom without
annihilation. If there are not a lot of warning messages, (less than a few per second) then that's fine. Otherwise you need to
check your phantom and source definition. The common error is that the part of the source is outside the phantom.

yuxuan






"Su, Yi" <suy at mir.wustl.edu>
Sent by: gate-users-bounces at lists.healthgrid.org

01/04/2008 01:31 PM


        To:        "'gate-users at lists.healthgrid.org'" <gate-users at lists.healthgrid.org>
        cc:
        Subject:        [Gate-users] GATE running problem--WARNING : positron found and photonID vector size 1




Hi there,

I am running a GATE simulation and the following warning message keeps popping up:

[GateTrajectoryNavigator::FindAnnihilationGammasTrackID]  WARNING : positron found and photonID vector size: 1

Does anyone know what is going on, and what might be the problem? I am using Gate 3.1.2 and I am simulating an ecat system with a simple cylinder phantom and source.

Thanks a lot,

Yi
__________________________________________
Yi Su, PhD
Division of Radiological Sciences
Mallinckrodt Institute of Radiology
Washington University School of Medicine
Campus Box 8225
510 S. Kingshighway Blvd
St. Louis MO 63110
Phone: 314-362-8363
Fax:       314-362-9940
Email: suy at mir.wustl.edu




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