[Gate-users] Ion source - timestamp problem Gate 6.0.1

[Didier Benoit]

Hi Mercedes,

Could you test your macro with GATE 6.1? Many bugs have been fixed concerning the sources in GATE.

Kind Regards,
Didier Benoit

On Mar 22, 2011, at 7:16 PM, Mercedes Rodriguez wrote:

> Dear Gate Users,
> 
> I'm trying to use an ion source (18F, 22Na or 15O) for a PETscanner geometry and the simulation provides strange results for the timestamps. For instance, I run the simulation using 18F, setTimeSlice=60 s and the time histogram for coincidence events goes from 0 to ~100000 s, following an exponential decay. No randoms and no scattered events are produced. My guess is that time sampling is incorrect when using an ion source.
> 
> When I run the simulation for e+ that have an 18F energy spectrum (and the corresponding half life) I obtain randoms and scattered events different from zero and the time histogram is what I expect, flat from 0 to 60 s. I'm attaching a pdf file with a couple of graphs for 18F (ion source and e+), Ao=4e5 Bq, TimeSlice=60s.
> 
> Any idea of what could be happening?
> 
> Regards.
> Mercedes
> 
> -- 
> Mercedes Rodriguez Villafuerte, Ph.D.
> Visiting Professor, Cherry's Lab
> BME, UC Davis
> 451 Health Sciences Drive, GBSF 2505
> Davis, CA 95616
> 
> Tel: 530-752-6387
> 
> <IonSource.pdf>_______________________________________________
> Gate-users mailing list
> Gate-users at lists.opengatecollaboration.org
> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users

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Didier BENOIT, GATE Engineer
Imagerie et Modélisation en Neurobiologie et Cancérologie (IMNC)
IMNC – UMR 8165 CNRS – Université Paris 7 – Université Paris 11
Campus d’Orsay
Bâtiment 440
91406 ORSAY Cedex
 
Tél : (33) 1 69 15 68 76
E-mail : benoit at imnc.in2p3.fr
http://www.imnc.in2p3.fr
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