<!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] Compton interactions within the crystal</TITLE>
</HEAD>
<BODY>
<!-- Converted from text/plain format -->
<P><FONT SIZE=2>Dear Anayisse,<BR>
<BR>
Very interesting question!<BR>
<BR>
>The ASCII file gateSingles.dat can give us the number of Compton interactions in detectors before reaching the detector.<BR>
>Can we have also the the ID of those detectors ?<BR>
<BR>
In principle, yes.<BR>
But I doubt if it is implemented in current GATE.<BR>
<BR>
>From GATE manual, what I can learn is that Singles is from Pulse, and the latter is given by centroid of hits (weighted by energy).<BR>
What I am not clear is if a Pulse is only related to individual detector. i.e., Can a photon generate and be recorded several Pulses<BR>
in different detectors (crystals) if scatter (and/or penetration) occurs?<BR>
<BR>
1)If yes, then it is possible to record the first pulse information besides that single (I assume it is centroid of pulses) information.<BR>
<BR>
2)If no, (that is, one photon, one pulse, one single) we can try to record the first hit information (global X,Y,Z and crystal ID) into<BR>
corresponding Single though they are not experiment-detectable.<BR>
<BR>
I prefer solution 2), which can give us precise information on how big the scatter and penetration effects are. <BR>
<BR>
My two cents.<BR>
<BR>
Yu Chen, Ph.D.<BR>
University of Massachusetts Medical School<BR>
Division of Nuclear Medicine<BR>
55 Lake Avenue North<BR>
Worcester, MA 01655-0243<BR>
Phone: (508) 856-6123<BR>
Fax: (508) 856-4572<BR>
<BR>
<BR>
<BR>
-----Original Message-----<BR>
From: gate-users-bounces@lists.healthgrid.org on behalf of anayisse arnaud<BR>
Sent: Tue 12/11/2007 12:11 AM<BR>
To: gate-users@lists.healthgrid.org<BR>
Subject: [Gate-users] Compton interactions within the crystal<BR>
<BR>
<BR>
Hi !<BR>
<BR>
I need your help Please !<BR>
<BR>
The ASCII file gateSingles.dat can give us the number of Compton interactions in detectors before reaching the detector.<BR>
Can we have also the the ID of those detectors ?<BR>
<BR>
Thanks in beforehand<BR>
Anayisse<BR>
<BR>
<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>
Gate-users mailing list<BR>
Gate-users@lists.healthgrid.org<BR>
<A HREF="http://lists.healthgrid.org/mailman/listinfo/gate-users">http://lists.healthgrid.org/mailman/listinfo/gate-users</A><BR>
<BR>
<BR>
</FONT>
</P>
</BODY>
</HTML>