[Gate-users] Coincidences: XYZ position of the annihilation in world referential

[Simon Stute]

Hi,

I think that it is the case for random coincidences. Check if there are
others coincidences that have the same XYZ position for both singles. If you
are simulating the PETbenchmark, you would have about 3,3% of random
coincidences, but if you have modeled your own scanner, maybe you put to
much activity or a too big time window in your coincidence sorter, and so
you will get a huge random coincidences percentage.

Hope it helps,
Simon

2007/11/19, 周凤银 <fengyin0629 at gmail.com>:
>
> Dear everyone:
>        I an simulating the PET machine by gate. When I see the
> gateCoincidences.dat, I find that the XYZ position of the annihilation in
> world referential in first single is different from the second single. I
> think the XYZ position of the annihilation should be same. I do not know
> why. I really hope there be someone can reply the question.
>        Thank you very much！
>
>
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