[Gate-users] Rejecting Coincidence From a Out of FOV Source

[Albert Grace Lieu]

Hi Xinjie,

I think you would be better off diving into the problem or data by yourself
rather than hoping to get some clues from others. In the long run, you are
getting challenged but that is how you improve your capability.

As to your question, are you sure that these coincidence events are from
the source outside the axial FoV? That sounds very weird, right? Each true
line of response (lor) shall cross the source itself (unless significant
scattering happened), however, you said the source is outside of PET axial
FoV. You may want to try to draw such a line representing the lor, see
whether it exists or not. Common ways to remove unqualified lors: 1.
setting up some geometry restriction, for example, the distance from the
source to the lor is smaller than a certain value 2. timing window, 3.
energy window.

Good luck.

Zhengzhi

On Thu, May 28, 2020 at 12:15 PM Xinjie Cao <xinjie.cao at stonybrook.edu>
wrote:

> Dear all,
>
> I am doing a PET scanner sensitivity evaluation, but I could still collect
> a coincidence pair even when I put the source out of axial FOV. I am
> wondering how to reject the coincidence out of FOV, does anyone can share
> some experience? Thanks!
>
> Any answer will be highly appreciated!
>
> Best,
> _______________________________________________
> Gate-users mailing list
> Gate-users at lists.opengatecollaboration.org
> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
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