[Gate-users] Detector inside voxelized phantom

[David Sarrut]

Hello,

in short : this is a known limitation, you cannot do that.

Indeed volumes cannot be overlapped (it is a G4 requirement). So if you
insert a volume A (detector) within the bounds of a volume B (voxel), A
must be child of B, and in this case the part of B within the A volume is
not seen.

Possible workarounds : reduce the size of B so that A is outside or create
A as voxels part of B.

I think that some groups (Brest) are currently working on an implementation
of hybrid volumes that could allow such situation. I think it is not yet
finished.

David


On Wed, Aug 24, 2016 at 9:15 PM, Francisco Pinto <
francisco.pinto at surgiceye.com> wrote:

> Dear fellow Gate users,
>
>
> I would be thankful to get some assistance with a current issue I'm
> facing. I am currently trying (and failing) to simulate the following
> scenario:
>
> - A voxelized phantom defined via a CT dataset in Analyze format.
>
> - A source placed inside the phantom.
>
> - A simple detector aiming towards the source.
>
>
> The problem I'm facing occurs when I place the detector inside the bounds
> of the voxelized phantom: When outside the bounds, the detector registers
> hits as expected. As soon as I move it inside the bounds, however, no hits
> are registered.
>
>
> Is this a known limitation or am I doing something wrong? I'm using the
> latest develop Gate on Ubuntu 16.04, CPU-only single core simulation.
>
> You may find all the relevant short scripts including the CT dataset here
> (17MB tgz): https://drive.google.com/open?id=0BzM9gTEQ3DYyYWFOcVRibklGdVk
>
> Use runSim.sh to run the simulation (you may need to change the Gate
> binary's name in the script).
>
>
> If anyone has any tips or pointers, they would be very much appreciated.
>
>
> Cheers and thanks in advance,
>
> Francisco
>
>
> Francisco Pinto
>
>
> Principal Software Engineer
> SurgicEye GmbH
> Tel: +49 89 54 99 89 0 - 21
>
> _______________________________________________
> Gate-users mailing list
> Gate-users at lists.opengatecollaboration.org
> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
>



-- 
David Sarrut, Phd
Directeur de recherche CNRS
CREATIS, UMR CNRS 5220, Inserm U1206
Centre de lutte contre le cancer Léon Bérard
28 rue Laënnec, 69373 Lyon cedex 08
Tel : 04 78 78 51 51 / 06 74 72 05 42
http://www.creatis.insa-lyon.fr/~dsarrut
_________________________________
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