[Gate-users] Calculate Trues, Randoms and Scatter coincidences

[Marta.Lai at ca.infn.it]

You could for sure recognise Trues from Random writing a simple code for
analyzing the TTree. you have a true  coicidence when:

- you find a coincidences with different crystalID and same eventID for
both photons (which means that the 2 photons come from the same
annihilation)

If you're simulating an extended source or a patient itself it could
happen that with this criterion you get also Scatter events when a photon
scatters with the phantom. personally, I don't  know if you could
recognise Scatter events in a simple way but if there is one, I'm looking
forward to know it!

You have a random event when you have different event ID from a couple of
photons.


Marta

> Dear Gaters,
>
>         I have recently succeeded in running simulations with
> CylindricalPET, Gate 5.0.0. I wonder which is the way to calculate the
> Trues, Randoms and Scatter coincidences when we use root-output, after
> launching ROOT-file with TBrowser t?
>
>         I have read the UsersGuide and all the relative answered in the
> archives, but I don't understand what exactly to do. could someone help
> me?
>
> Thanks so much in advance,
> Karpetas George
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