[Gate-users] Problem in modeling a trapezoid

[Hojjat Mahani]

Dear GATE users,

I have modeled a trapezoid as the collimator in my SPECT simulation. 
Everything seems to be right, but, I have faced an unexpected problem: an extra volume exists inside the trapezoid (as shown in attached figure).

Here are the commands used to define aforementioned trapezoid:

# Collimator (Trapezoidal Collimator)
/gate/world/daughters/name collimator
/gate/world/daughters/insert trpd
/gate/collimator/geometry/setX1Length 10 cm
/gate/collimator/geometry/setY1Length 5 cm
/gate/collimator/geometry/setX2Length 10 cm
/gate/collimator/geometry/setY2Length 1 cm
/gate/collimator/geometry/setZLength  3.0  cm
/gate/collimator/setMaterial Lead
/gate/collimator/vis/setColor red
/gate/collimator/vis/forceWireframe

Any suggestion or idea would be appreciated; thank you in advance.

 

Hojjat Mahani, 
PhD Candidate of Medical Radiation Engineering.
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