[Gate-users] Dose Collection Problems with Voxelized Phantom; Gate V6.1

[Matthew Belley]

Dear Gate Users,

I am encountering two problems with dose collection for a voxel phantom:

 1. When I use the "parameterizedBoxMatrix" or the "regularMatrix"
    commands (following "/gate/world/daughters/insert") the binary
    data-set that I get is very sparse - only a handful of pixels are
    non-zero.  However, I am able to get a good dose measurement when I
    use the "compressedMatrix"  command (following
    "/gate/world/daughters/insert").  Why do the other two commands
    ("parameterizedBoxMatrix" or the "regularMatrix") not give similar
    results?  I am running all simulations with the same number of
    particles.
 2. When I use the "compressedMatrix"  command I am not able to get the
    uncertainty data file even when I use the command
    "/gate/output/doseOutput/saveUncertainty true".  However, if I use
    "parameterizedBoxMatrix" command, I do get the uncertainty data file
    (but it is sparse and almost all zeros for similar reasons explained
    in question 1).  How can I enable the uncertainty data file for the
    "compressedMatrix" command?

Any suggestions/solutions/comments for how to resolve these two problems 
would be appreciated!

Best Regards,

-- 
Matthew Belley

Medical Physics Ph.D. Student
Duke University