[Gate-users] How to kill scattered photons without recording their track during simulation ?

[dan ma]

Hi all, 
 
I need to speed up SPECT simulation because it costs two days or more to get the results even when I set low activity. 
 
One of the methods I think is to stop recording its information after knowing one photon already been scattered. I don't know how to realize it in GATE. 
 
Does anyone know how to do it? Or are there any other ways to speed up the simulations? 
 
Thanks, 
 
Dan   
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