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<TITLE>RE: [Gate-users] Z position</TITLE>
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<P><FONT SIZE=2>I strongly suspect you were plotting "hit" not "singles".<BR>
<BR>
The following is my message last time to you:<BR>
<BR>
>Are you sure you plotted *Singles*?<BR>
>From you macro, we can't see any digitizing module used.<BR>
<BR>
>You generated 20000*3 photons but have more than 60000 entries.<BR>
>It may explain some if what you actually plotted is hit (step) point position.<BR>
<BR>
<BR>
Put<BR>
/gate/output/root/setRootSinglesFlag 1<BR>
in your mac<BR>
and no energy window needed<BR>
<BR>
Run 1000 bq and 1 sec<BR>
send your root file to me.<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 venialgo_e<BR>
Sent: Mon 2/18/2008 12:34 PM<BR>
To: Chen, Yu; gate-users@lists.healthgrid.org<BR>
Subject: RE: [Gate-users] Z position<BR>
<BR>
Yes, I don't have any digitalizer modules, because I have done Matlab <BR>
scripts in the way to have more freedom to select scatter and <BR>
photoelectric interactions or both, calculate position using weighted <BR>
average for position, and apply energy windows, etc.<BR>
<BR>
Anyway I connect an adder and a energy window to system and...<BR>
<BR>
In case 1 there are two peaks of counts in the crystal's top face, if <BR>
the digitalizer is only an adder. The name of the files are <BR>
case1_wo_window.gif and case1_wo_window.mac .But if the digitalizer <BR>
has an adder and energy window, so there is a maximum of counts in 18 <BR>
mm approx. .The files for that case are case1digitalizer.gif and <BR>
case1digitalizer.mac.<BR>
<BR>
For case 2, is the same than before. There are counts only in second <BR>
half of the crystal with an adder and energy window. The files are <BR>
case2digitalizer.gif and case2digitalizer.mac.<BR>
<BR>
And, In case 3, There is a maximum of counts in 10 mm approx, with and <BR>
adder and energy window. The files are case3digitalizer.gif and <BR>
case3digitalizer.mac .<BR>
<BR>
<BR>
<BR>
I can't understand the different shapes of Z position. I expected and <BR>
exponential decreasing shape.<BR>
<BR>
<BR>
<BR>
Thanks a lot for your support.<BR>
Esteban Venialgo.<BR>
<BR>
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