[Gate-users] Physic List SPECT system

[Marta Coelho]

Hi Maxime,

Thank you very much for the answer, it helped a lot.
Yes, I have tried to perform the simulation a few times and some results
are a little far from the reference values.
But I will keep trying to do my best.

Best regards,
Marta Coelho





maxime <maxime.chauvin at inserm.fr> escreveu no dia sexta, 24/04/2020 à(s)
08:15:

> Hi Marta,
>
> here in the documentation you can find the different physics lists, and
> you are right it is recommend to use physics builder.
> https://opengate.readthedocs.io/en/latest/setting_up_the_physics.html
>
> If you need high precision for all the processes, for example for
> dosimetry applications, it is recommended to use either emlivermore or
> emstandard_opt4:
>
> /gate/physics/addPhysicsList emlivermore
>
> or
>
> /gate/physics/addPhysicsList emstandard_opt4
>
> But…
>
> When simulating SPECT, you may only be interested in photons (X-ray,
> gammas) reaching your detector
> so you may want to have only processes related to photons in your physics
> list.
> This is possible ONLY if you build your own physics list with macro
> commands such as (not the addPhysicsList) :
>
> /gate/physics/addProcess [Process] [Particle]
>
> Your SPECT simulation will be faster that way but you should be really
> careful to not forget something that might impact the result.
> I only recommend this to advanced users.
>
> I hope it helps.
>
> Best regards,
>   Maxime Chauvin
>
> On 24 Apr 2020, at 00:56, Marta Coelho <martinhaonline109 at gmail.com>
> wrote:
>
> Hi GATE users,
>
> I installed the VGATE 8.2 platform. and I have doubts about the physical
> part of the script to simulate the SPECTHead system.
> The manual says "Up to now, physic lists were set in GATE according to
> macro files containing list of command to add physical processes. From GATE
> Version 7.0, we highly recommend to switch to the" physic list builder
> "mechanism. The physic-list builders are provided by the Geant4 community.
> To use a builder, use the “addPhyslicsList”.
> My question is: What is the best physics lists for simulating a SPECT
> system?
>
> Thank you for your attention and I look forward to an answer.
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>
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