<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7651.59">
<TITLE>RE: [Gate-users] How to kill scattered photons without recording their track during simulation ?</TITLE>
</HEAD>
<BODY>
<!-- Converted from text/plain format -->
<P><FONT SIZE=2>Try comment out Scattering processes in your physics.mac module like this:<BR>
<BR>
# EM P R O C E S S<BR>
#/gate/physics/gamma/selectRayleigh lowenergy<BR>
/gate/physics/gamma/selectPhotoelectric standard<BR>
#/gate/physics/gamma/selectCompton standard<BR>
<BR>
use<BR>
/gate/physics/gamma/listProcesses<BR>
<BR>
to see which process you really selected.<BR>
<BR>
Yu Chen, Ph.D.<BR>
University of Massachusetts Medical School<BR>
Department of Radiology<BR>
55 Lake Avenue North<BR>
Worcester, MA 01655-0243<BR>
Phone: (508) 856-6123<BR>
Fax: (508) 856-6363<BR>
<BR>
<BR>
<BR>
-----Original Message-----<BR>
From: gate-users-bounces@lists.healthgrid.org on behalf of dan ma<BR>
Sent: Fri 6/20/2008 11:35 AM<BR>
To: gate-users@lists.healthgrid.org<BR>
Subject: [Gate-users] How to kill scattered photons without recording their track during simulation ?<BR>
<BR>
<BR>
Hi all,<BR>
<BR>
I need to speed up SPECT simulation because it costs two days or more to get the results even when I set low activity.<BR>
<BR>
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.<BR>
<BR>
Does anyone know how to do it? Or are there any other ways to speed up the simulations?<BR>
<BR>
Thanks,<BR>
<BR>
Dan <BR>
_________________________________________________________________<BR>
News, entertainment and everything you care about at Live.com. Get it now!<BR>
<A HREF="http://www.live.com/getstarted.aspx">http://www.live.com/getstarted.aspx</A><BR>
<BR>
</FONT>
</P>
</BODY>
</HTML>