[Gate-users] Prloblems using HounsfieldMaterialGenerator
Yannick.Berker at philips.com
Fri Oct 21 11:54:55 CEST 2011
Dear GATE users,
I have some issues using the HounsfieldMaterialGenerator to simulate a PET scan of a patient. The simulation itself is running fine, but I am lacking two features that I am used to from other simulations, which are scatter information and color visualization. I mainly used the example from http://www.creatis.insa-lyon.fr/gate/Example2/ to generate the following phantom:
/gate/HounsfieldMaterialGenerator/SetDensityTolerance 0.03 g/cm3
The ROOT output shows me that the volume is placed correctly, and the distribution of detected coincidences also shows the effect of photon attenuation by the phantom. However, I cannot attach a VoxelPhantomSD to the patient - I receive an error message telling me that this command is unavailable:
[G4-cerr] ***** COMMAND NOT FOUND </gate/patient/attachVoxelPhantomSD> *****
Attaching an ordinary PhantomSD seems to work, but only generates 0 entries in ComptonPhantom and RayleighPhantom. I also tried using a ImageNestedParametrisedVolume, with no effect. ComptonCrystal entries, however, seem to be correct (>= 0).
Apart from that, how can I visualize the voxelized phantom using colors? I was not able to add color attributes (like "true 0.5 0.5 0.5 1.0") to p971-HU2mat.txt manually, since this resulted in the following error message:
src/GateVImageVolume.cc (l.332): No Hounsfield material defined in the file CT/p971s3_ToSim_OneBP_HU2mat_Colors.txt. Abort
Does anyone have knowledge in this area, or can point to some helpful documentation on this topic? The GATE User's Guide has a few, but only incomplete examples for the case of voxelized phantoms and sources.
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