[Gate-users] Distinguish original photon energy?

[Konstantinos P. Chatzipapas]

Have you try to filter hits using ParentID leaf?
Konstantinos


    Στις Πέμπτη, 3 Μαρτίου 2022, 06:40:49 μ.μ. CET, ο χρήστης Larry Pierce <lapierce at uw.edu> έγραψε:  
 
 Yes, I see, thank you! 
However, there may be scattered imaging photons in the window as well as scattered high-energy photons in the window. 
I want to know the fraction of imaging photons and high-energy photons that contributed to the window. 
If there is a way to know this for each hit or single, that would be a great help. 
Thanks for the advice!
-Larry Pierce



On Mar 3, 2022, at 9:27 AM, Konstantinos P. Chatzipapas <konhat88 at yahoo.gr> wrote:
Hello there,
If you have a limited window (let's say 159 keV, 10%), you may limit your result to scatter and unscattered photons of this energy. If you are using root you may set comptonPhantom==0 or !=0, as a parameter.
Does that help?
Kind Regards,Konstantinos

​​----Konstantinos CHATZIPAPAS | PhD, CNRS | "Interactions Rayonnements Ionisants & Biologie" (iRiBio)Centre d'Etudes Nucléaires de Bordeaux-Gradignan - UMR 5797https://www.cenbg.in2p3.fr/


Στις Πέμπτη, 3 Μαρτίου 2022, 06:07:00 μ.μ. CET, ο χρήστης Larry Pierce <lapierce at uw.edu> έγραψε:

Dear GATE users, 

I have a question regarding simulation of I-123, with 83% of the emission photons at 159 keV used for imaging. It also has 3% of the photons emitted being higher-energy up to 784 keV and these can contaminate the data and reconstructed image. 

When simulating our SPECT detector, I would like to know the energy of the original photon to determine if it was an “imaging photon” or a “higher-energy photon” that led to the hit or single in the detector.

Does anyone know of a way to do this in GATE?

I have considered that we may use multiple overlapping spectrum sources with a mixture of imaging and high-energy photons and that the output source ID can then tell us if the originating photon was an imaging photon or a high-energy photon. 

Still, I would like to ask the group for their input if there are other better ways to approach the issue.

Thank you for your consideration, 

-Larry Pierce




_______________________________________________
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/20220303/2d775360/attachment.html>