<div dir="ltr">Hello, <div><br></div><div>did you perform simulations with Lu177+decay or only gammas (~3%+11% of decays) ? What kind of source type (point, sphere, voxel ?)</div><div><br></div><div>Try to make smaller experiment, with low statistic and without VIP, to check that everything else seems ok (proportionally).</div><div><br></div><div>Sincerely, </div><div>David</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Apr 26, 2018 at 7:48 AM, Niels van der Werf <span dir="ltr"><<a href="mailto:nrvdwerf@gmail.com" target="_blank">nrvdwerf@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word;line-break:after-white-space">Dear all,<div><br></div><div>For my current project I’m trying to simulate the acquisition of the Jaszczak phantom filled with 100 MBq Lu-177 on a Symbia SPECT system. For this, I use the VIP-network (<a href="http://vip.creatis.insa-lyon.fr" target="_blank">http://vip.creatis.insa-lyon.<wbr>fr</a>) where the amount of primaries are calculated as time per projection (30s) times initial activity. This results in 30x100 000 000 = 3 000 000 000 primaries. </div><div><br></div><div>For the Lu-177 activity, I use the MIRD radionuclide data and decay schemes, 2nd edition, KF Eckerman & A Endo Eds, The Society of Nuclear Medicine, Reston, VA, SNM, 2008, as proposed in several GATE examples. </div><div><br></div><div>When this experiment is performed in real life, we get about 14000 counts per slice in 30 seconds for the highest photo peak . However, the simulation only gives about 1400 counts per slice. So, only about 10% of the counts are given for the experiment. </div><div><br></div><div>Does anyone have a suggestion where this difference can come from? Thanks in advance for your time!</div><div><br></div><div>Best regards,</div><div>Niels van der Werf </div><div>Erasmus MC - The Netherlands</div></div><br>______________________________<wbr>_________________<br>
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