[Gate-users] No match results

[Marcin Balcerzyk]

Dear Mario.

Take a look at your LYSO material definition in GATE and GEANT4. LYSO is a mixture of Lu and Y at the proportions which may vary greately between crystal producers. Default LYSO in Gate has a lot of Y if I remember well. This may be the cause of your problems.

Best regards
Marcin Balcerzyk
Universidad Complutense de Madrid

___________________
Mario wrote:
Message: 2
Date: Wed, 11 Mar 2009 10:39:11 +0100
From: mario bachaalany <mario at sbgmail.in2p3.fr>
Subject: [Gate-users] No match results
To: gate-users at lists.healthgrid.org
Message-ID: <49B786BF.3080505 at sbgmail.in2p3.fr>
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Hi all,

I'm simulating a system with four detectors made of LYSO crystals, a 
fluorine-18 as source, and two spheres of water as a phantom using GATE 
and Geant4, and I'm not getting with GATE the same deposited energy 
histogram in the hits branch (edep) as in Geant4. In Geant4 i can see 
two obvious peaks (expected), the first at about 450 keV which simulates 
the X escape on the Lutetium K-alpha1 ray for the photoelectric effect 
and the second lower one at 511 keV. But in GATE i only have one peak on 
511 keV. I tried to change the physics but the only thing I get is a 
high peak near to 0 keV and a peak on 450 keV representing only 0.4% of 
the total hits and it happens when i put the photoelectric at low energy.

I would be very thankful about any idea that fixes this problem.

Best regards
Mario
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