[Gate-users] Distinguish original photon energy?

Larry Pierce lapierce at uw.edu
Thu Mar 3 19:26:35 CET 2022

No, I have not. Can you tell me what informationis in parentID ? Does that tell the originating particle (I-123) or the originating photon energy?



On Mar 3, 2022, at 10:12 AM, Konstantinos P. Chatzipapas <konhat88 at yahoo.gr> wrote:

Have you try to filter hits using ParentID leaf?


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<mailto: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 CHATZIPAPAS | PhD, CNRS | "Interactions Rayonnements Ionisants & Biologie" (iRiBio)
Centre d'Etudes Nucléaires de Bordeaux-Gradignan - UMR 5797

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