[Gate-users] How to determine positron emission points

[Paulo Caribé]

Hi Rukiah,

I would highly recommend double check your Physics list and make sure that the annihilation process was “enabled”  (/gate/physics/addProcess   PositronAnnihilation). In addition, take into account the the physic list mechanism has been changing since the GATEv 7.0 and now there is a big change as compared to GATEv 8.1.
To find out more:

http://wiki.opengatecollaboration.org/index.php/Users_Guide:Setting_up_the_physics

Cheers
Paulo
___________________________________________

Doctoral researcher
Ghent University & KU Leuven - CNPq
Medical Imaging and Signal Processing (MEDISIP)












On 13 Sep 2018, at 08:12, Rukiah <katoshka_7880 at yahoo.com<mailto:katoshka_7880 at yahoo.com>> wrote:

Hi Gate users,

To measure a positron range, I had to collect the positron annihilation points coordinates and emission points coordinates. As I am an intermediate user of GATE and Linux, I used this method to collect the coordinates:

#to print all simulation output on screen
/tracking/verbose 2

#extract the annihilation point coordinates
Gate code.mac | grep "phantom_phys annihil" >output.txt

However, I have difficulties to find the emission points as there is no physics process output that related to it, except the process called
'initStep' for example as attached. Can anyone confirm if the InitStep is actually represents the emission points?

Thank you.



Rukiah A Latiff
PhD student
The University of Sydney
<Gate_InitStep.png>_______________________________________________
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