[Gate-users] Parametric Surface

[John Apostolakis]

Dear Maikol,

As far as I know what you request would require (a significant amount 
of) extra code in both Geant4 and GATE to achieve.

The complicated volumes like G4TwistedTrd are not widely used, so I 
would be surprised if they are available for non-trivial use in any 
general application created on top of Geant4 - including GATE.   ( I.e. 
maybe in some you could create an 'unimportant' volume - one which might 
influence the simulation slightly, but you don't need to sub-divide it.)

Slicing a relatively simple like a G4Para into slanted volume elements 
(not 'rectangular' voxels) is already a non-trivial effort.  Doing it 
for a complicated volume like G4TwistedTrd or a Tesselated volume is 
even harder, likely requiring a much larger effort to achieve.

Note: This is not an authoritative GATE answer - the GATE authors could 
provide confirmation/correction.

John

On 17/03/17 10:37, maikol salas ramirez wrote:
> Hi
>
> I would like to simulate a parametric surface volume, but trying to 
> avoid the use of a Voxel grid, due to the energy of the electrons (low 
> energy) that I have to simulate, it is expected some problems of 
> overestimation of the surface area of the interfaces (even for very 
> small voxel), due to the voxelized interfaces.
>
> I am wondering if in Gate is possible to introduce a parametric volume 
> for example a twisted trapezoid as in GEANT4 (G4TwistedTrd) where the 
> "voxels" are deformed (no cubic) and to obtain the Dose in the volume 
> (like a concrete value), not in a squared Dose grid as is the case of 
> the DoseActor. And mainly avoid a voxelized interface.
>
> The general idea is working with CAD, mesh data or parametric volumes.
>
> I appreciate your advises.
>
> Best regards
>
>
>
>
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