[Gate-users] Back to Back source

Emmanuel BRARD emmanuel.brard at iphc.cnrs.fr
Tue Feb 22 13:40:31 CET 2011

I first used the command and then run the simulation without the command (default value): 
	/gate/source/twogamma/setAccolinearityFlag false 
Where twogamma is my back to back source. 

I wrote all interaction points of the gammas (PDGEncoding == 22 and photonID == 1 || 2 )  to a file and then I use a CERN Root script I wrote for reverse ray tracing according to eventID. I simply see the emission point  (from the singles file) and the interaction points within my detector. Considering that I use no phantom and I am running in vaccum (with a value of 0 declared in the file which is then set to 1e -25 g/cm3 by Geant), the two points (source - first in det) should be a straight line. Well I also have a program which tells me when (eventID) the LOR would be too much outside the image I am imaging. 

This is pretty (when the stats. Is high enough) reliable even if the best way would be to write both the momentum projections of the gamma to the Geant4 terminal. Yet again I cannot do it here at the lab because of compilation issues, I could do it this week at home though.  Can you think of a faster way to do it ? (My tracking script was already working this is why I used it even if this is not its purpose). 

PS : However I think there is an error in the Get method which is call GeteAcco... is the source files. 


-----Message d'origine-----
De : Seb [mailto:sebastien.jan at cea.fr] 
Envoyé : mardi 22 février 2011 11:55
À : Emmanuel BRARD
Cc : gate-users at lists.opengatecollaboration.org
Objet : Re: [Gate-users] Back to Back source

> ¨If you set the AccolinearityFlag at false (default value)¨ I still have some non pure btb emission

How did you check this point ?


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