[Gate-users] semi-cylinder detector not recording dose?

[Konstantinos P. Chatzipapas]

Dear Musa,
In general, spherical coordinates use only numbers >0 (I think theta 0-180 and phi 0-360). Thus, using: "/gate/Filmactive2/geometry/setPhiStart -45 deg", probably produces an error. 
I would recommend to start phi from zero and then rotate the volume 315 degrees. You could also try to set the Phi start at 315 degrees. 

Kind Regards,Konstantinos


----------------------------------------------------- Konstantinos Chatzipapas
    Medical Physicist, PhD
       University of Patras
 web: Physics Magazine 

    Στις Κυριακή, 10 Οκτωβρίου 2021, 12:58:26 μ.μ. EEST, ο χρήστης Musajoya Joya <musajoyajoya at gmail.com> έγραψε:  
 
 Dear GATE users, 
I have defined a semi-cylinder dose detector as the following; 
/gate/phantom/daughters/name                      Filmactive2
/gate/phantom/daughters/insert                    cylinder
/gate/Filmactive2/geometry/setRmin                 2.2403 cm
/gate/Filmactive2/geometry/setRmax                 2.2431 cm
/gate/Filmactive2/geometry/setPhiStart            -45 deg
/gate/Filmactive2/geometry/setDeltaPhi             75 deg
/gate/Filmactive2/geometry/setHeight               1 cm
/gate/Filmactive2/placement/setTranslation        0.0 0 11 cm
/gate/Filmactive2/placement/setRotationAxis       0 0 1
/gate/Filmactive2/setMaterial                     Filmactivelayer

I attached a DoseActor to that volume, 
/gate/actor/addActor                           DoseActor  targetdose2
/gate/actor/targetdose2/attachTo                   Filmactive2
/gate/actor/targetdose2/stepHitType                random
/gate/actor/targetdose2/setPosition                0 0 0 cm
/gate/actor/targetdose2/save                       output/target/targetdose2.txt
/gate/actor/targetdose2/saveEveryNSeconds          60
/gate/actor/targetdose2/enableDose                 true
/gate/actor/targetdose2/enableUncertaintyDose      true

Unfortunately, the problem is that this combination does not record any dose and the output is always zero. But, When I change the detector to a complete cylinder (as below) it calculates the dose. /gate/phantom/daughters/name                      Filmactive2
/gate/phantom/daughters/insert                    cylinder
/gate/Filmactive2/geometry/setRmin                 2.2403 cm
/gate/Filmactive2/geometry/setRmax                 2.2431 cm
/gate/Filmactive2/geometry/setPhiStart            0 deg
/gate/Filmactive2/geometry/setDeltaPhi            360 deg
/gate/Filmactive2/geometry/setHeight               1 cm
/gate/Filmactive2/placement/setTranslation        0.0 0 11 cm
/gate/Filmactive2/placement/setRotationAxis       0 0 1
/gate/Filmactive2/setMaterial                     Filmactivelayer
I marked the difference between two codes in orange color, dose any one knows the problem what is wrong? please help it is vital for my work. 

Best Wishes

Musa Joya

Ph.D. candidate in Medical Physics 

Tehran University of Medical Sciences

Tehran, Iran &

Lecturer of Medical Physics 

Kabul University of Medical Sciences

Kabul, Afghanistan

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