<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body text="#330033" bgcolor="#CCCCCC">
<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>
</body>
</html>