[Gate-users] Extremely low scatter detection in XCAT phantom

[Constantine Mountris]

Hello Gate-Users,
I am using the XCAT phantom to simulate some PET and SPECT studies of activity uptake in the liver and in a spherical tumour located in the liver. There is no activity in the rest of my phantom. 

I have used the command attachVoxelSD to my phantom, but in my simulation the scatter photons are extremely low around 3% and it's not seem normal. 


Had anyone come up with this problem in the past?
Any advices would be well accepted. Thank you in advance.

This is part of my .mac : 


#===================================================
# PHANTOM
#===================================================

/gate/world/daughters/name                                                   youri
/gate/world/daughters/insert                                                   regularMatrix
/gate/youri/geometry/insertReader                                        interfile
/gate/youri/interfileReader/insertTranslator                         range
/gate/youri/interfileReader/rangeTranslator/readTable   ../data/attenuation.dat
/gate/youri/interfileReader/rangeTranslator/describe         1
/gate/youri/interfileReader/readFile                                     ../data/youri_cancered_atn_1.h33
/gate/youri/placement/setRotationAxis                               1 0 0
/gate/youri/placement/setRotationAngle                            0 deg
/gate/youri/placement/setTranslation                                  0. 0. -18. mm
/gate/youri/attachVoxelPhantomSD

#=======================================
# VOXELIZED SOURCES
#=======================================

/gate/source/addSource                                                                            GaMAA voxel
/gate/source/GaMAA/reader/insert                                                          interfile
/gate/source/GaMAA/interfileReader/translator/insert                          range
/gate/source/GaMAA/interfileReader/rangeTranslator/readTable     ../data/activityTCMAA.dat
/gate/source/GaMAA/interfileReader/rangeTranslator/describe       1
/gate/source/GaMAA/interfileReader/readFile              ../data/youri_cancered_atn_1.h33
/gate/source/GaMAA/gps/particle                                   ion
/gate/source/GaMAA/gps/ion                                           31 68 0 0
/gate/source/GaMAA/gps/energytype                             Mono 
/gate/source/GaMAA/gps/monoenergy                           0. eV
/gate/source/GaMAA/setForcedUnstableFlag               true
/gate/source/GaMAA/useDefaultHalfLife 
/gate/source/GaMAA/setPosition                                   -192.0 -192.0 -304.5 mm
/gate/source/GaMAA/gps/angtype                                  iso
/gate/source/GaMAA/gps/confine                                   NULL
/gate/source/GaMAA/dump                                             1
/gate/source/list



Best regards,
Konstantinos Mountris.



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http://about.me/constantine.mountris :.
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