<div dir="ltr">Hello Matthias, <div><br></div><div>it is already rather good. I suggest opt4 instead of opt3 (not sure it changes a lot, but this is the recommended physics list). </div><div>What cuts did you used ? </div><div><br></div><div>best, </div><div>David</div><div>PS: you may be interested in this work regarding replacing phase space file with a neural network: <a href="https://github.com/OpenGATE/GateContrib/tree/master/dosimetry/gaga-phsp">https://github.com/OpenGATE/GateContrib/tree/master/dosimetry/gaga-phsp</a></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Dec 17, 2020 at 9:23 AM Hartmann, Matthias <<a href="mailto:Matthias.Hartmann@hirslanden.ch">Matthias.Hartmann@hirslanden.ch</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 lang="DE-CH">
<div class="gmail-m_-3140372225136140622WordSection1">
<p class="MsoNormal"><span lang="EN-US">Dear Gate-user,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">I want to simulate a simple 6MV photon open field (defined by jaws) beam in a water phantom, using a phase space as source.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">I selected emstandard_opt3 for the physics list, 2x10E9 total number of primaries and a voxel resolution of 4x4x4mm.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">I would expect a more or less smoothed pdd and dose profiles. In comparison with measurements, I get the following result:<u></u><u></u></span></p>
<p class="MsoNormal"><span><img width="421" height="240" id="gmail-m_-3140372225136140622Grafik_x0020_1" src="cid:176d68825b84ce8e91"></span><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Which parameter do I have to adapt to get a better agreement with the measurements?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks for your help!<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Matthias<u></u><u></u></span></p>
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<a href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users" rel="noreferrer" target="_blank">http://lists.opengatecollaboration.org/mailman/listinfo/gate-users</a></blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr">David Sarrut, Phd<br>Directeur de recherche CNRS<br>CREATIS, UMR CNRS 5220, Inserm U1206<div>Centre de lutte contre le cancer Léon Bérard<br>28 rue Laënnec, 69373 Lyon cedex 08<br>Tel : 04 78 78 51 51 / 06 74 72 05 42<br><a href="http://www.creatis.insa-lyon.fr/~dsarrut" target="_blank">http://www.creatis.insa-lyon.fr/~dsarrut</a><br>_________________________________</div><div> "2 + 2 = 5, for extremely large values of 2"<br>_________________________________</div></div></div></div></div></div></div>