<div dir="ltr"><div><div>Hi,<br><br></div>Try to add the following line to your "digitizer module":<br><br>/gate/digitizer/Coincidences/minSectorDifference 1<br><br></div>This changes the default value of the minimum sector difference for valid coincidences (default value is equal to 2). When you use only 2 detector heads the difference between sectors for valid coincidences will be always equal to 1. <br>
For cylindrical systems (with 4 or more heads) this option allows you to choose to save only the coincidences that were detected in opposite detectors (minSectorDifference 2, for 4 head geometry) and not those that were detected in adjacent detectors (minSectorDifference 1).<br>
<div><div><div><br>-------------------------------------------------------------------<br>Ricardo Capote<br><div>
<br>
<span lang="en"><span>Institute</span> <span>of Biophysics and</span> <span>Biomedical Engineering</span><br> <span>Faculty</span> <span>of Science, University</span> <span>of Lisbon</span></span><br>
Campo Grande<br>
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Tel. <a value="+351217500177">+ 351 21 750 01 77</a>; Fax: <a value="+351217500030">+ 351 21 750 00 30</a><br>
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Email: <a href="mailto:rmcapote@fc.ul.pt" target="_blank">rmcapote@fc.ul.pt</a><br>Website: <a href="http://www.ibeb.fc.ul.pt/" target="_blank">http://www.ibeb.fc.ul.pt/</a></div><div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">2013/6/11 <span dir="ltr"><<a href="mailto:gate-users-request@lists.opengatecollaboration.org" target="_blank">gate-users-request@lists.opengatecollaboration.org</a>></span><br>
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Today's Topics:<br>
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1. some coincidence problem when setting the repeat number of<br>
ring by number of 2 (??)<br>
<br>
<br>
----------------------------------------------------------------------<br>
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Message: 1<br>
Date: Mon, 10 Jun 2013 23:04:48 +0800 (GMT+08:00)<br>
From: ?? <<a href="mailto:chenze@impcas.ac.cn" target="_blank">chenze@impcas.ac.cn</a>><br>
To: <a href="mailto:gate-users@lists.opengatecollaboration.org" target="_blank">gate-users@lists.opengatecollaboration.org</a><br>
Subject: [Gate-users] some coincidence problem when setting the repeat<br>
number of ring by number of 2<br>
Message-ID: <<a href="mailto:14dd0b6.e173.13f2e9e3720.Coremail.chenze@impcas.ac.cn" target="_blank">14dd0b6.e173.13f2e9e3720.Coremail.chenze@impcas.ac.cn</a>><br>
Content-Type: text/plain; charset="gbk"<br>
<br>
Hi,<br>
I am trying to simulate the detetor with dual head geometry,<br>
so i modify the PET_Cylindrical_System macro nothing but the repeat number of ring from 4 to 2.<br>
But someting strange happens, when using "4", everything seems ok, the coincidence tree had data in it,<br>
when using "2", the coincidence tree is empty, seems nothing filled into the coincidence tree.<br>
But it should behave that way. Can anyone give me some advice?<br>
regards,<br>
<br>
<br>
<br>
<br>
<br>
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