[Gate-users] Extremely low scatter in XCAT phantom GATE v6.2

[Michaela Gaens]

Dear Konstantinos,

yes, we have have also had this problem before in our group. There seems to be a problem with the regularMatrix navigator in Gate v6.2. If I remember correctly it worked with our installation of Gate v6.1. Of course the problem might also arise from the different underlying Geant4 versions, I'm not sure about that.

What you could do is switch to a different navigator, e.g. compressedMatrix. This will be a bit slower though.

Hope this helps.

Best regards,
Michaela

On 04/03/2014 09:59 AM, Constantine Mountris wrote:
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.



----

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



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