[Gate-users] Divergence between GATE simulation and the reality

[Albert Grace Lieu]

Thanks, Julien for your experience and your great paper. It is definitely
good to know that other GATE users also got overestimation for some reason.
My case might be a little bit different as one pixel is coupled to one
readout channel. I will read your paper and follow the suggestions.

Thanks again.
Sincere wishes,

Zhengzhi

On Tue, Jun 2, 2020 at 12:28 AM Julien Salvadori <j.salvadori89 at gmail.com>
wrote:

> Greetings,
>
> I had the same problem when I modeled the Vereos PET, namely an
> overestimation of the NEMA sensitivity by about 25%.
>
> In my case, this was because I had not modeled the intrinsic detection
> efficiency. (the transfer efficiency of the crystal and the quantum
> efficiency of the photo-detector).
>
> Did you take this parameter into account ?
>
> If you don't have the manufacturer's information, you can estimate it by
> following the methodology described by Guez et al (2008), which we used to
> estimate the efficiency of the Vereos PET (Salvadori et al (2020)).
>
> Best
>
> Julien Salvadori
>
> Le ven. 29 mai 2020 à 19:33, Albert Grace Lieu <albertnew2018 at gmail.com>
> a écrit :
>
>> Dear GATE users,
>>
>> I have modeled a real PET system in GATE as close to the real system as I
>> can. However, during the noise equivalent count collaboration, GATE is
>> always much better (about 50%) than the real system. After lots of effort,
>> we looked at the results of the NEMA sensitivity experiment (very low dose,
>> ~500 uci) and found that GATE collected about 25% more counts than the real
>> system.
>>
>> I was wondering if there is some calibration work done between GATE
>> simulation and reality. Could someone give any help on how to further debug
>> or make clear what causes this discrepancy between simulation and reality?
>>
>> Thanks a lot.
>> Zhengzhi
>> _______________________________________________
>> Gate-users mailing list
>> Gate-users at lists.opengatecollaboration.org
>> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opengatecollaboration.org/pipermail/gate-users/attachments/20200602/3ffda1ae/attachment.html>