[Gate-users] Simulation killed

David Sarrut David.Sarrut at creatis.insa-lyon.fr
Thu Aug 28 09:20:48 CEST 2014


no idea, but probably a memory leak somewhere. Please try with the git
develop version (and G4 10.0) I have seen some recent commit with memory
leak correction, maybe it is related.


On Fri, Jul 4, 2014 at 10:13 AM, <florian.bretin at ulg.ac.be> wrote:

> Dear Gate users & experts,
> I am simulating a microCT acquisition of 220 projections over 193° of
> rotation. A PMMA phantom (Analyze7.5 image) was implemented as
> “ImageNestedParametrisedVolume” into the center of rotation and is rotated
> instead of the gantry. After the simulation I collect the dose profiles for
> analysis inside the phantom from the dose map.
> The simulation is run with 6e+07 photons / sec and 16ms exposure per
> projection (total simulation time of 3.52). Im using Gate v6.1 on Ubuntu
> 11.10, 22Gb of ram and Intel Xenon 6 core X5670.
> Here is a link to the simulation files:
> https://www.dropbox.com/s/2mt6kchejnho0qi/microCT.rar
> Now I have two problems:
> 1.      The simulation runs fine with the X-ray source being in the center
> position of the phantom. However, when I translate the phantom 40mm into
> positive X-direction, the simulation is killed after 177 projections. The
> error message I get is simply “Simulation killed”, no error code. During
> projection 177 the memory piles up completely (including Swap) until the
> simulation is killed. I have googled the problem including the mailing list
> but did not find a solution. Did anyone ever face a similar problem? Any
> ideas?
> 2.      The second problem is, that I have dose deposition in air outside
> of the phantom, which I cannot explain. I am simulating less photons than
> the actual tube emits and I scale the resulting dose maps to experimental
> results in order to reach the number of photons the tube emits. My wild
> guesses are: 1) amplification of noise due to the scaling, 2) scatter from
> the phantom due to the sharp edge.
> Here is a link to the dose profiles:
> https://www.dropbox.com/s/z3q35cekb0ekr59/GateExampleDoseProfile.tif
> https://www.dropbox.com/s/ly16idlbmqndkkq/PhantomHUvsDose.tif
> Any help / ideas would be much appreciated.
> Thanks in advance & kind regards
> Florian Bretin
> Cyclotron Research Centre, University of Liege, Belgium
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David Sarrut, Phd
Directeur de recherche CNRS
CREATIS, UMR CNRS 5220, Inserm U 1044
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
 "2 + 2 = 5,  for extremely large values of 2"
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