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

[Chen, Yu]

Try comment out Scattering processes in your physics.mac module like this:

#       EM  P R O C E S S
#/gate/physics/gamma/selectRayleigh lowenergy
/gate/physics/gamma/selectPhotoelectric standard
#/gate/physics/gamma/selectCompton standard

use 
/gate/physics/gamma/listProcesses

to see which process you really selected.

Yu Chen, Ph.D. 
University of Massachusetts Medical School 
Department of Radiology 
55 Lake Avenue North 
Worcester, MA 01655-0243 
Phone: (508) 856-6123 
Fax: (508) 856-6363



-----Original Message-----
From: gate-users-bounces at lists.healthgrid.org on behalf of dan ma
Sent: Fri 6/20/2008 11:35 AM
To: gate-users at lists.healthgrid.org
Subject: [Gate-users] How to kill scattered photons without recording their track during simulation ?
 

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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