[Gate-users] Re : (no subject)

[Priegnitz, Marlen]

Hi Dounia,

as far as I know, all coincidences are stored. Not only trues, but all 
prompts.
In then user guide (I searched in version 3.1.1., probably in the newer ones 
it is also described) is written, that you can choose, what happens with 
multiple coincidences (TakeAllGoods, TakeWinnerOfGoods, ....)
Futhermore you can add delayed windows for random coincidences, as you do in 
experiment.
But if you only want to know, if your gamma-pair really comes from ONE 
annihilation and is NOT a random coincidence, than you can have a look at the 
eventID.
"Each Single emitted from a given source particle is stored with an event ID 
number, which uniquely identify the decay from which the single is coming 
from. If two eventID numbers are not identical in a coincident event, the 
event is defined as a Random coincidence." (page 113, UserGuide3.1.1).

Hope this helps.
Kind regards,
Marlen



Am Tue, 09 Feb 2010 13:38:44 -0500 schrieb dounia84 at aol.com:
> 
> hi,
> 
> Thank you for this answer cheick but I am still missing something, I don't 
>get what kind of coincidences are reported in root, is it the true one 
>(Rtrue=Rtotal - Rscatter - Rrandom) or the "prompt"?
> 
> Cheers,
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> -----E-mail d'origine-----
> De : THIAM Cheick 219838 <cheick.thiam at cea.fr>
> A : dounia84 at aol.com; gate-users at lists.opengatecollaboration.org
> Envoyé le : Mardi, 9 Février 2010 18:12
> Sujet : RE: [Gate-users] (no subject)
> 
> 
> Hi
> 
> The ROOT file is filled during simulation and contains three reps: 
> - Hits: containing the news for hits, 
> - Singles: containing the news for digitizer (pulses),
> - Coincidences: containing the news for the coincidences in the case of a 
>PET 
> simulation.
> 
> Hit is a snapshot of the physical interaction of a track within a sensitive 
> region of a detector. All information: position and time of the step, energy 
>of 
> the track, energy deposition of the step...
> 
> The digitization consists of a series of signal processors. The output at 
>each 
> step along the series is defined as a pulse. At the end of the chain, the 
>output 
> pulses are named singles. These Singles realistically simulate the physical 
> observables of a detector's response to a particle interacting with it. 
> 
> You can find more explanations in the gate UserGuide.  
> 
> Hope this helps, 
> Cheick
> 
> 
> 
> -----Message d'origine-----
> De : gate-users-bounces at lists.opengatecollaboration.org 
>[mailto:gate-users-bounces at lists.opengatecollaboration.org] 
> De la part de dounia84 at aol.com
> Envoyé : mardi 9 février 2010 15:46
> À : gate-users at lists.opengatecollaboration.org
> Objet : [Gate-users] (no subject)
> 
> 
> Hello,
> 
> I am trying to model a micropet scanner.I was wondering how one can get the 
> number of true events (prompts - random - scatter).  I am using root v5.20 
>and 
> my Browser displays three classes : 
> Coincidences, Singles and Hits. Does coincidence class refer to trues 
>events? Or 
> prompts? What is the difference between Single and Hits?
> I am missing some understanding...
> If anyone could help,
> 
> 
> 
> -- 
> Dounia Taleb
> Imagerie medicale experimentale - Département de physique
> Université de Liège - Institut de Physique, B5
> B-4000 Liège 1 (Sart-Tilman) - Belgique
> Tel: +32-4-3663152
> 
> 
> 
> 
> 
> 
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