[Gate-users] Cold Phantom...

[Ismet Isnaini]

Hi everyone, 

I was trying to perform an acquisition of a cold phantom, but I could not get 
the correct image.., I have compared the reconstructed image / root file with 
those sources without cold region, it is very similar.. as if there is no cold 
region in the acquisition.

Below is part of the  code, 

/gate/world/daughters/name cold_area
/gate/world/daughters/insert cylinder
/gate/cold_area/geometry/setRmax 10. mm
/gate/cold_area/geometry/setRmin 0. mm
/gate/cold_area/geometry/setHeight 2. mm
#/gate/cold_area/setMaterial Polyethylene 
/gate/cold_area/setMaterial Water 
/gate/cold_area/vis/setColor white
/gate/cold_area/vis/forceWireframe
/gate/cold_area/vis/setVisible 1
#/gate/cold_area/attachPhantomSD

# Segment 1 _ diameter  2.5 mm

/gate/source/addSource sphere1
/gate/source/sphere1/setActivity 1250. Bq
/gate/source/sphere1/gps/centre 0. 0. 0. mm
/gate/source/sphere1/gps/particle e+
/gate/source/sphere1/gps/energytype Mono
/gate/source/sphere1/gps/monoenergy 511. keV
/gate/source/sphere1/gps/type Volume
#/gate/source/sphere1/gps/shape Sphere
#/gate/source/sphere1/gps/radius 1.25 mm
/gate/source/sphere1/gps/shape Cylinder
/gate/source/sphere1/gps/radius 50 mm
/gate/source/sphere1/gps/halfz 1 mm
/gate/source/sphere1/gps/angtype iso
/gate/source/sphere1/gps/Forbid cold_area
/gate/source/sphere1/dump 1 
/gate/source/list


and if I have more than 1 cold region, is the following code correct ? 


/gate/source/sphere1/gps/Forbid cold_area1
/gate/source/sphere1/dump 1 
/gate/source/sphere1/gps/Forbid cold_area2
/gate/source/sphere1/dump 2 
/gate/source/sphere1/gps/Forbid  cold_area3
/gate/source/sphere1/dump 3 
/gate/source/sphere1/gps/Forbid cold_area4
/gate/source/sphere1/dump 4 
/gate/source/list


thanks for your kind help 

regards

ismet