[Gate-users] Crashing with a detector nested in a vox phantom

[Francisco Pinto]

Dear David,

Thank you once more for your assistance and your hint regarding MHD!

- simulation with vox + source outside the volume (check everything is ok)

This fails with a descriptive error message:

-------- EEEE ------- G4Exception-START -------- EEEE -------
*** G4Exception : GeomMgt0002
      issued by : G4SmartVoxelHeader::BuildNodes()
PANIC! - Overlapping daughter with mother volume.
         Daughter physical volume SPECThead_phys
         is entirely outside mother logical volume voxPhantom_log !!
*** Fatal Exception *** core dump ***

The source being inside or outside the bounds of the vox phantom leads to the same outcome: the same crash as described in my initial email. Do you perhaps have further insights?

Thank you very much once more!

Cheers,
Francisco


From: David Sarrut [mailto:David.Sarrut at creatis.insa-lyon.fr]
Sent: 02 September 2016 08:46
To: Francisco Pinto <francisco.pinto at surgiceye.com>
Cc: gate-users at lists.opengatecollaboration.org; Philipp Matthies <Philipp.Matthies at surgiceye.com>
Subject: Re: [Gate-users] Crashing with a detector nested in a vox phantom

Hello Francisco,

does it works if the volumes do not overlap ? Try step by step:
- simulation with vox + source outside the volume (check everything is ok)
- simulation with vox + source inside the volume (check everything is ok)
- simulation with vox + ouside source + outside spect system (check everything is ok)
- end with your final goal

btw, I recommend to use mhd file format rather than hdr (see wiki).

David


On Tue, Aug 30, 2016 at 2:10 PM, Francisco Pinto <francisco.pinto at surgiceye.com<mailto:francisco.pinto at surgiceye.com>> wrote:
Dear fellow Gate users,

I am simulating the current 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.

I would like to overlap the detector with the CT dataset. To this end, I changed the voxelized phantom to an ImageRegionalizedVolume and made my detector its daughter. Sadly, Gate crashes. I’ve narrowed this down the crash to GateCrystalSD::FindSystem(G4String&) – voxPhantom cannot be found.

I'm using the latest develop Gate on Ubuntu 16.04, CPU-only single core simulation. All relevant short scripts + CT dataset here (23MB tgz): https://drive.google.com/open?id=0BzM9gTEQ3DYybEdvR0RoV3I3bzA

Any insights would be much appreciated! Thanks in advance!

Cheers,
Francisco

Francisco Pinto

Principal Software Engineer
SurgicEye GmbH
Tel: +49 89 54 99 89 0 - 21


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David Sarrut, Phd
Directeur de recherche CNRS
CREATIS, UMR CNRS 5220, Inserm U1206
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