[Gate-users] Collimators in Gate

[Andreas Menzel]

Dear Gate community,

I found that you seem to have two collimator types already implemented, 
but neither of them works for me at the moment.
*1. The parallel hole collimator* (parallelbeam) complains about a 
material not being defined:

[Physic-0] The following Geant4's physic-list is enabled :emstandard_opt3

[Core-0] Initialization of geometry

GateVVolume.cc (l.189): The material of the volume side hole 1 is not defined.

         Nb of children:       0

tems/SPECThead/pixel'

         Attached to volume: pixel

I don't think this is due to me using it incorrectly, because the same 
commands (except focus related stuff) work for the other kind of collimator.

*2. The "parametrized" collimator*

This seems to work, but the version on the git didn't allow the material 
to be set. I asked the developer who did the corresponding change, and 
it seems to work now. Would you like a pull request?

Finally, I realized that both these collimator types are not built like 
other geometric structures, meaning they are not derived from 
GateVVolume. Is this intentional, or is it because it is older code? I 
would like to know before I start hacking things.

Best regards and thanks for your help!

Andreas Menzel

-- 
Dr. Andreas Menzel

Crystal Photonics GmbH
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D - 12489 Berlin
Germany

FAX.: +49 (0) 30 34669299

am at crystal-photonics.com
www.crystal-photonics.com
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