<html dir="ltr"> <head> <meta http-equiv="Content-Type" content="text/html; charset=Windows-1252"> <style id="owaParaStyle" type="text/css"></style> </head> <body ocsi="0" fpstyle="1" bgcolor="#FFFFFF"> <div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Thanks Nicolas and Simon for your help. I finally solved my problem alone, it was due to a basic error in my analysis program. Sorry ! Best regards, Sylvain <div style="font-family: Times New Roman; color: #000000; font-size: 16px"> <hr tabindex="-1"> <div style="direction: ltr;" id="divRpF178718">De : narbor [nicolas.arbor@iphc.cnrs.fr] Date d'envoi : mercredi 5 août 2015 21:56 À : gate-users@lists.opengatecollaboration.org; REUZE SYLVAIN Objet : Re: [Gate-users] Dose actor and uncertainties </div> <div></div> <div>Hi Sylvain, Here is a short summary (in french) about dose uncertainty in GATE that I've wrote some times ago (it's a personnal note...so quite basic and not very well written). Hope it helps to answer your questions. If something is not clear, don't hesitate to send me a mail. Best regards, Nicolas Arbor <pre class="moz-signature" cols="72">*********************************************************************** Nicolas ARBOR Maître de Conférences Université de Strasbourg - UFR Physique et Ingénierie Groupe de recherche RaMsEs - Institut Pluridisciplinaire Hubert Curien 23, rue du Loess BP28 67037 Strasbourg Cedex 2 mail : <a class="moz-txt-link-abbreviated" href="mailto:nicolas.arbor@iphc.cnrs.fr" target="_blank">nicolas.arbor@iphc.cnrs.fr</a> / tel : 03.88.10.64.27 ***********************************************************************</pre> <div class="moz-cite-prefix">Le 05/08/2015 13:38, REUZE SYLVAIN a écrit : </div> <blockquote type="cite"><style>  BODY {direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;}P {margin-top:0;margin-bottom:0;}BODY {scrollbar-base-color:undefined;scrollbar-highlight-color:undefined;scrollbar-darkshadow-color:undefined;scrollbar-track-color:undefined;scrollbar-arrow-color:undefined}</style> <div class="Section1"> Dear Gate users, I have an issue with dose actor uncertainties. I’ve read several threads on the mailing list about uncertainty calculation, but I don’t understand the output of the dose-uncertainty file. In my simulation, I have a linac model with an input phase space at the end of the patient-independent part, and I would like to know uncertainty in a region of interest of my dose chart, recorded in a water phantom. Values of the dose chart very low (~ 10^-8), and values of the uncertainty chart are between 6 and 10. Are these values relative (in %) or absolute ? And when I try to use dose squared and dose with a formula (Visvikis et al.: <a href="https://hal.archives-ouvertes.fr/in2p3-00025095/document" target="_blank"> https://hal.archives-ouvertes.fr/in2p3-00025095/document</a>), I have negative values under the square root. Could you help me ? Best regards, Sylvain Reuzé Intern in medical physics GUSTAVE ROUSSY Radiotherapy - Medical Physics Department Tél. : (+0033) 1 42 11 54 06 <a href="http://www.gustaveroussy.fr/" target="_blank">www.gustaveroussy.fr</a> <img id="_x0000_i1026" src="cid:part3.02000204.08040101@iphc.cnrs.fr" align="bottom" height="155" border="0" width="300"> </div> <fieldset class="mimeAttachmentHeader" target="_blank"></fieldset> <pre>_______________________________________________ Gate-users mailing list <a class="moz-txt-link-abbreviated" href="mailto:Gate-users@lists.opengatecollaboration.org" target="_blank">Gate-users@lists.opengatecollaboration.org</a> <a class="moz-txt-link-freetext" href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users" target="_blank">http://lists.opengatecollaboration.org/mailman/listinfo/gate-users</a></pre> </blockquote> </div> </div> </div> </body> </html>