[Gate-users] Source not confined properly, spills outside confinement volume

Tue Mar 11 09:37:39 CET 2014

Hi Uwe and thanks for the suggestion!

Unfortunately it didn't solve the problem, the source is still only
partially confined. I've also tried making a cold volume (in this case the
lower half of the cylinder. I only want activity in the top half) and
forbid activity in that region, but that doesn't seem to work either. I
still get coincidences (and source visualization) in regions where I
shouldn't.

On Mon, Mar 10, 2014 at 10:11 PM, Pietrzyk, Uwe <u.pietrzyk at fz-juelich.de>wrote:

>
> Hi Ida,
>
> we once ran into a similar problem and the solution was
> to use (now for your example) the line
>
> /gate/source/F18_upper/gps/confine upperinterior
>
> instead of your original
> /gate/source/F18_upper/gps/confine upperinterior_P
>
> Hence, simply remove the "_P". We checked it and it
> works for our examples
>
> Kind regards and best wishes,
>
> Uwe Pietrzyk
> /----------------------------------------------------------------------
> Prof. Dr. Uwe Pietrzyk
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> &
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>
> On 10.03.2014, at 20:52, Ida Häggström wrote:
>
> Hello and thanks for your reply!
>
> Yes, I did run a short simulation (I also thought it might have been just
> the visualization), but unfortunately when looking at the *.raw output
> images it shows that the source has indeed spilled out. I get scattered and
> true coincidences originating from the spilled out areas.
>
> If I can't find a solution I guess I'm left with doing a voxelized
> source...
>
> Thanks again!
> Ida
>
>
>
> On Mon, Mar 10, 2014 at 6:34 PM, Marc Chamberland <
> MarcChamberland at cmail.carleton.ca<mailto:MarcChamberland at cmail.carleton.ca>>
> wrote:
> Hi Ida,
>
> Did you try a short simulation with your macro and did you confirm that
> the source is not properly confined? (For example, by looking at the source
> position distribution in the Root output.)
>
> The reason I'm asking is that, in the past, I've found limitations in the
> Geant4 visualization code. For example, see this thread from the mailing
> list:
> http://article.gmane.org/gmane.comp.science.opengate.user/3109/match=source+visualize
>
> My first instinct is that this may be related.
>
> Marc
>
>
>
> __________________________
>
> Marc Chamberland, MSc
> PhD candidate
> Department of Physics
> Carleton University
> Ottawa (ON)
>
> On Mar 10, 2014, at 11:34, Ida Häggström <ida.haggstrom at radfys.umu.se
> <mailto:ida.haggstrom at radfys.umu.se><mailto:ida.haggstrom at radfys.umu.se
> <mailto:ida.haggstrom at radfys.umu.se>>> wrote:
>
> Hello!
>
> I'm trying to confine a source to a particular phantom geometry, but
> cannot get it to work properly. Part of the source spills out outside the
> confinement volume. Below are codes for the phantom + source and a
> visualization image where you can see the issue.
>
> Any ideas how to solve this?
>
> Thank you in advance! Sincerely,
> Ida
>
> #       P H A N T O M
> /gate/world/daughters/name upperinterior
> /gate/world/daughters/insert cylinder
> /gate/upperinterior/placement/setTranslation 0.0 -3.5 -3.7 cm
> /gate/upperinterior/geometry/setRmax 14.7 cm
> /gate/upperinterior/geometry/setRmin  0.0 cm
> /gate/upperinterior/geometry/setHeight 21.4 cm
> /gate/upperinterior/geometry/setPhiStart 0. deg
> /gate/upperinterior/geometry/setDeltaPhi 180. deg
> /gate/upperinterior/setMaterial Water
> /gate/upperinterior/vis/forceWireframe
> /gate/upperinterior/vis/setColor blue
>
> #       S O U R C E
> /gate/source/addSource F18_upper
> /gate/source/F18_upper/setActivity 1  becquerel
> /gate/source/F18_upper/gps/particle e+
> /gate/source/F18_upper/setForcedUnstableFlag true
> /gate/source/F18_upper/setForcedHalfLife 6586.2 s
> /gate/source/F18_upper/gps/energytype Fluor18
> /gate/source/F18_upper/gps/type Volume
> /gate/source/F18_upper/gps/shape Cylinder
> /gate/source/F18_upper/gps/radius 14.7 cm
> /gate/source/F18_upper/gps/halfz  10.7 cm
> /gate/source/F18_upper/gps/angtype iso
> /gate/source/F18_upper/gps/centre 0.0 -3.5 -3.7 cm
> /gate/source/F18_upper/gps/confine upperinterior_P
> /gate/source/F18_upper/visualize 1000 cyan 2
>
>
> <source_confinement.PNG>_______________________________________________
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