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Question Primative Scorers in Parameterised Volume 

Keywords: Primative Scorer, Hits, Voxel Phantom
Forum: Hits, Digitization and Pileup
Date: 02 Jul, 2006
From: Jonathan <Jonathan>

Hello all. I am a currently trying to build a voxel phantom based on a 3D parameterisation. I have assigned a multifunctional detector to the logical volume assigned to my parameterisation, and I have registered G4PSDoseDeposit and G4PSEnergyDeposit to the MFD. I place a simple monoenergetic isotropic point source at the center of the box, and simulate around 100000 events. I would expect to see many hits in the voxels (I am starting around 20x20x20, 1mm^3 with 50keV or so e-), but I only get a few hits scored on the outside edge of the volume. I have been able to visualize the volume and the trajectories, and all of the volumes appear to be placed correctly. I have implemented the Run and RunAction classes based on the RE02 example, and it is strange because it compiles fine and I do see scores in around 5 voxels (out of 8000). I have looked at the tracks, and all of the particles appear to be interacting and losing energy, but are not being scored. I have also increased the volume to 128x128x128+ to see if they were just escaping and I get the same results. The range cuts are set to 100nm for all particles (e-, e+, gamma). The phantom is composed of mostly water. I am a grad student who doesn't have too much experience with the toolkit, so it may be a simple mistake. Thanks for any advice you can give!

Regards, Jonathan

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1 None: Re: Primative Scorers in Parameterised Volume   (Makoto Asai - 05 Jul, 2006)
1 None: Re: Primative Scorers in Parameterised Volume   (Jonathan Rogers - 05 Jul, 2006)
1 None: Re: Primative Scorers in Parameterised Volume   (Sylvia Studeny - 05 Jul, 2006)
... 2 Message(s)
3 None: Re: Primative Scorers in Parameterised Volume   (Jonathan Rogers - 05 Jul, 2006)
3 None: Re: Primative Scorers in Parameterised Volume   (Makoto Asai - 06 Jul, 2006)
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