<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body text="#330033" bgcolor="#CCCCCC">
<p>Hello users<br>
</p>
<p><br>
</p>
<p>I come back to answer my question.<br>
</p>
Singles1and Singles2 of coincidences sorted by time, not by trackID,
thus the time of Singles1 is always later than the Singles2, and the
DOI of Singles1 is deeper than Singles2. <br>
<p>One can plot the distribution of time1 minus time2.<br>
</p>
<p>Chunhui<br>
</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 2018/12/7 02:07, yy wrote:<br>
</div>
<blockquote type="cite"
cite="mid:c8fed6ed-074c-903f-2e9a-012da16feb99@gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<p>Hello Gate-developers </p>
<p><br>
</p>
<p>I constructed a PET cylinder scanner, and run simulation, where
the source is back-to-back Gamma sourece of 511 keV
isotropically . </p>
<p>But when I plot the DOI of singles 1 and single 2 of
coincidences. I find the distribution of DOI of singles 1 is
correct, like an experiential , however, the DOI of singles 2
is not, which is wrong obviously. </p>
<p>I just wonder whether the position calculation of Gate is
wrong for singles 2 of coincidences.</p>
<p>BTW, my Gate version is V8.0<br>
</p>
<p><br>
</p>
<p>Regards,<br>
</p>
<p>Chunhui</p>
</blockquote>
</body>
</html>