[Gate-users] Distinguish original photon energy?

[Larry Pierce]

Thank you, I believe that you are correct!

-Larry


> On Mar 10, 2022, at 1:20 AM, Dimitrios Thanasas <dthanas at uoa.gr> wrote:
> 
> Dear Larry,
> 
> To my mind, the best way to do this is, as you write, using multiple
> overlapping ("Mono") sources with different energy and intensity. At
> column 3 at Gate Singles file, the ID of the source is stored.
> 
> Regards,
> Dimitris
> 
> -- 
> --------------------------
> Dimitrios Thanasas, PhD
> Medical Physicist
> Medical Physics Lab
> Medical School
> National and Kapodistrian University of Athens
> --------------------------
> 
>> 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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> 
> 
> 
> 
>