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

Tue Mar 11 00:09:09 CET 2014

Thanks for the tip, Uwe!

I looked at the latest source code of Gate available to the public and I think the User's Guide is outdated about this command. You are right, no "_P" is needed at the end of the volume name for the confine (or forbid) command.

(Technically, according to the source code, the user should add the tag "_phys" to the volume name for the confine command; but if you leave it out, the code adds the tag by itself, so...)

Cheers,
Marc

__________________________

Marc Chamberland, MSc
PhD candidate
Department of Physics
Carleton University
Ottawa (ON)

On Mar 10, 2014, at 17:10, Pietrzyk, Uwe <u.pietrzyk at fz-juelich.de<mailto: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
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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

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