[Gate-users] Gate 3.1.2 vs Gate 4.0

[Seb]

Hi Ross,

First, I would like to say that nothing in the code was changed between 
version 3.1.2 et 4.0, regarding the physical processes when you use the 
classical navigator. This is why I can't give you a direct and clear 
solution.
Could you check the globalPos (X-Y-Z) variables between the 2 versions ? 
Is there a difference in this event distribution ?

Cheers
Seb
>
> I'm working with Hyejoo on this and we have confirmed that we are 
> using the correct low EM processes. The differences that we have seen 
> in the sinograms for identical models and input parameters are 
> dramatic (I've attached the figures to this email, sinogramS top and 
> sinogramTheta bottom).  These differences seem too large to be due to 
> a refinement in the low energy model associated with the new release 
> of G4.  We are going to perform another GATE run with a simple 
> asymmetric phantom (I'm thinking an elliptical cylinder phantom with a 
> 4:1 hot cylinder offset) and run it with both standard GATE shapes and 
> as a voxelized phantom and see if we can pin down the culprit.  Any 
> ideas on your side?
>
> Cheers,
>
> ross
>