[Gate-users] hadrontherapy

["Séverine Rossomme"]

Dear Gate users,

I need some advice about applications for hadrontherapy. I would like
determine the dose distribution of a proton beam (60MeV and 200MeV). In
the file "hadrontherapyStandardPhys.mac", I don't understand differences
between  HadronElastic and UHadronElastic. In the repertory
"examples/example_Radotherapy/Novice_1", only one process (HadronElastic) 
is include, and in examples/example_Radotherapy/Novice_3, there are
HadronElastic AND UhadronElastic. What are differences ?


In my code, I use the tools of “Actor” to obtain the dose distribution.
Extract of my code :
/gate/actor/addActor                          DoseActor  doseDistribution
/gate/actor/doseDistribution/save             Output_txt/Config-DoseTOT.txt
/gate/actor/doseDistribution/attachTo         Core
/gate/actor/doseDistribution/stepHitType      random
/gate/actor/doseDistribution/setPosition      0 0 0 cm
/gate/actor/doseDistribution/setResolution    1 1 500

I have 2 questions about this.

1. Could you tell me where the value of the dose is determined ? At the
beginning, at the middle or at the end of the step ? In other words, is
that the first value of the dose correspond to the position 0 ? Is it
determined by “stepHitType”

2. I use a cylinder phantom (radius : 5cm, end height : 3.5cm). In the
beginning of the output file, I can read :

####################################
# Matrix Size= (100,100,35)
# Resol      = (1,1,500)
# VoxelSize  = (100,100,0.07)
# nbVal      = 500
####################################

Could you help me to understand these informations ? Especially “Matrix
Size= (100,100,35)” and “VoxelSize  = (100,100,0.07)”.


Thank you.

Best regards,
Severine Rossomme