<div dir="ltr">Hi Zahra,<div><br></div><div>I think it is normal, my NEMA test is similar. You could also find the similar situation in some PET simulation papers.</div><div><br></div><div>Best,</div><div>Xinjie</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Aug 2, 2020 at 1:51 AM Zahra Fathihossienabadi <<a href="mailto:zahrafathi71@ph.iut.ac.ir">zahrafathi71@ph.iut.ac.ir</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="font-size:10pt;font-family:Tahoma,Arial,Helvetica,sans-serif">
<p><span style="font-family:"times new roman",times,serif;font-size:12pt">Hi dear users</span><br><span style="font-family:"times new roman",times,serif;font-size:12pt">I want to get the scatter fraction and true and random rate so that I can calculate parameter NECR.</span><br><span style="font-family:"times new roman",times,serif;font-size:12pt">I putted the phantom similar to the NEMA.</span><br><span style="font-family:"times new roman",times,serif;font-size:12pt">for example When I want to calculated NECR for 10 kBq/ml, the true rate is much lower than the random rate.</span><br><span style="font-family:"times new roman",times,serif;font-size:12pt">Is this normal or is there something wrong with my simulation?</span></p>
<p><span style="font-family:"times new roman",times,serif;font-size:12pt">Thanks in advance for any answers.</span></p>
</div>
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