[Gate-users] How to determine positron emission points

[Rukiah]

Hi Pablo,Thank you for your suggestion.I am using Gate7.2 and managed to obtain the annihilations point. However,I cannot get the emissions point and that is where I am stucked.Is it possible to get the emissions point data? I wonder if the process called ‘initStep’ represents the emissions point.Thank you.


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On Friday, September 14, 2018, 8:40 pm, Paulo Caribé <Paulo.Caribe at UGent.be> wrote:

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
CheersPaulo___________________________________________
Doctoral researcher
Ghent University & KU Leuven - CNPqMedical Imaging and Signal Processing (MEDISIP)












On 13 Sep 2018, at 08:12, Rukiah <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 LatiffPhD studentThe University of Sydney
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