[Gate-users] 2 Head PET

[Kerhoas-Cavata Sophie]

Hello José,
   If 2 singles are found within your time cincidence window, they have to valid another condition which is the difference between their sector number (defautl value is 2). If your singles are defined at the level of your head detector, and because you have only 2 head, this condition is never achieved. You should change this defautl value and try
/gate/digitizer/Coincidences/minSectorDifference 0

hope this help,
bye
sophie

-------------------------
Sophie Kerhoas-Cavata
DSM/DAPNIA/SphN
tel:+33 1 69 08 33 68
mel: sophie.cavata at cea.fr





-----Original Message-----
From: gate-users-bounces at lists.healthgrid.org on behalf of José Ramos
Sent: Tue 5/6/2008 9:49 PM
To: gate-users at lists.healthgrid.org
Subject: [Gate-users] 2 Head PET
 
Dear GATE users:
Actually I'm try to simulate a two head PET for small animals, I'm using an
array of 20x20 crystals with dimensions 2.4x2.4x10mm3, the distance between
the opposite detector heads is 80mm and the septal distance is 0.2mm. My
problem is that I can't obtain coincidences, my coincidence time window is
10 ns and the source is F18 e+. Does anybody what's happen?
Best regards

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