[Gate-users] Distinguish original photon energy?

Konstantinos P. Chatzipapas konhat88 at yahoo.gr
Thu Mar 3 18:27:25 CET 2022

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

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