[Gate-users] Matrix and voxel size of voxelized phantom and source input.

[maxime]

Hello Rukiah,

in GATE the source is independent from the geometry. 
So the voxel dimensions (matrix size and voxel size) of the source do not need to be the same as your voxelized geometry.

In the example page 18, I think they suggest using a lower resolution geometry compared to the source to speed up the simulation.
Be careful though, if you do so, the scoring resolution (with a DoseActor for example) will also be lower (the DoseActor is recommended to have the same dimensions as the geometry).

If you don’t mind the computation time I suggest you use the same source and geometry dimensions, so it’s easier to match the source locations with the phantom geometry (you can use the same image input to define both).

Best regards,
  Maxime Chauvin

> On 26 Jun 2019, at 02:33, Rukiah <katoshka_7880 at yahoo.com> wrote:
> 
> Hi Gate-users,
> 
> I have a query on the strategy to develop a voxelized phantom based on the training material page 18 below:
> http://www.opengatecollaboration.org/sites/default/files/Talk4.pdf
> It was shown that the attenuation image does not necessarily have the same volume with the emission image in terms of voxel size and matrix size. How it could be? Will it induce any mismatch mapping especially at the border of tissues? My understanding is the attenuation image must have the same matrix and voxel size with emission image so that the GATE can map the emission distribution correctly due to the same scale of both images. Have anyone experienced this issue and can clarify this?
> 
> Thank you.
>  
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