<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style type="text/css" style="display:none;"></style> </head> <body dir="ltr"> <div id="divtagdefaultwrapper" style="font-size:12pt; color:#000000; background-color:#FFFFFF; font-family:Calibri,Arial,Helvetica,sans-serif"> Dear Gate users, I have recently been working on a simulation of a PET scan. And I am using both the Coincidences and a Delayed Coincidences setting. When analysing the results I find that the amount of randoms inside the Delays branch is significantly bigger (~60%) than the amount of randoms in the Coincidences branch. Additionally the spectral distribution has more counts in the low energy regions. I would expect them to have a similar amount of counts and spectral distribution since I am working with low activities. I am using the default setting for multiple coincidences (keepIfAllAreGoods) but I do not know whether this is enough to justify those results. Is this normal? Has anyone come across anything similar? Best regards, Alberto Sanchez-Pastor </div> </body> </html>