[Gate-users] SOURCE-RECTANGULAR

[Lorena Vázquez Canelas]

Hi Gaters,
i made a case very simplified of simulation without forbid comand but the reconstruction is a little strange! 

              
It's only rectangular source (as background) and two spheres of 10 and 
13 mm of diameter, but shape according to image is circular and no 
rectangular.
The output that i have to reconstruct the image is through sinograms to use STIR later. 
My code is only the following:

/gate/world/daughters/name                          phantom4
/gate/world/daughters/insert                          box
/gate/phantom4/geometry/setXLength          14. cm
/gate/phantom4/geometry/setYLength          8.3 cm
/gate/phantom4/geometry/setZLength          21.5 cm
/gate/phantom4/placement/setTranslation     0.0 -7.65 0.0 cm
/gate/phantom4/setMaterial                           Air
/gate/phantom4/attachPhantomSD

# SOURCES:
# Background
/gate/source/addSource                          twogamma
/gate/source/twogamma/setActivity         90 MBq
/gate/source/twogamma/setType             backtoback
/gate/source/twogamma/gps/particle         gamma
/gate/source/twogamma/gps/energytype        Mono
/gate/source/twogamma/gps/monoenergy        0.511 MeV
/gate/source/twogamma/gps/type             Volume
/gate/source/twogamma/gps/shape            Para
/gate/source/twogamma/gps/halfx            7 cm
/gate/source/twogamma/gps/halfy            3.85 cm
/gate/source/twogamma/gps/halfz            10.15 cm
/gate/source/twogamma/gps/centre        0. -7.35 0. cm
/gate/source/twogamma/gps/angtype        iso
/gate/source/twogamma/gps/mintheta        0. deg
/gate/source/twogamma/gps/maxtheta        180. deg
/gate/source/twogamma/gps/minphi        0. deg
/gate/source/twogamma/gps/maxphi        360. deg
/gate/source/list

# Sphere 10mm diameter:
/gate/source/addSource            10mm
/gate/source/10mm/setActivity         200 MBq 
/gate/source/10mm/setType         backtoback
/gate/source/10mm/gps/particle         gamma
/gate/source/10mm/gps/energytype    Mono
/gate/source/10mm/gps/monoenergy    0.511 MeV
/gate/source/10mm/gps/type         Volume
/gate/source/10mm/gps/shape        Sphere
/gate/source/10mm/gps/radius        0.5 cm
/gate/source/10mm/gps/centre        -2.86 -4.954 0. cm
/gate/source/10mm/gps/angtype        iso
/gate/source/10mm/gps/mintheta        0. deg
/gate/source/10mm/gps/maxtheta        180. deg
/gate/source/10mm/gps/minphi        0. deg
/gate/source/10mm/gps/maxphi        360. deg
/gate/source/list

# Sphere 13 mm diameter:
/gate/source/addSource                    13mm
/gate/source/13mm/setActivity         200 MBq 
/gate/source/13mm/setType            backtoback
/gate/source/13mm/gps/particle         gamma
/gate/source/13mm/gps/energytype    Mono
/gate/source/13mm/gps/monoenergy    0.511 MeV
/gate/source/13mm/gps/type         Volume
/gate/source/13mm/gps/shape        Sphere
/gate/source/13mm/gps/radius        0.65 cm
/gate/source/13mm/gps/centre        2.86 -4.954 0. cm
/gate/source/13mm/gps/angtype        iso
/gate/source/13mm/gps/mintheta        0. deg
/gate/source/13mm/gps/maxtheta        180. deg
/gate/source/13mm/gps/minphi        0. deg
/gate/source/13mm/gps/maxphi        360. deg
/gate/source/list

Do you know what can it happen?
Thanks in advance!!

 		 	   		  
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