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<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">Dear Gate users,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span lang="EN-GB" style="font-size:
10.0pt;font-family:Arial">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.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span lang="EN-GB" style="font-size:
10.0pt;font-family:Arial">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.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span lang="EN-GB" style="font-size:
10.0pt;font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span lang="EN-GB" style="font-size:
10.0pt;font-family:Arial">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
?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span lang="EN-GB" style="font-size:
10.0pt;font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span lang="EN-GB" style="font-size:
10.0pt;font-family:Arial">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">https://hal.archives-ouvertes.fr/in2p3-00025095/document</a>), I have negative values under the square root.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span lang="EN-GB" style="font-size:
10.0pt;font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span lang="EN-GB" style="font-size:
10.0pt;font-family:Arial">Could you help me ?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span lang="EN-GB" style="font-size:
10.0pt;font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span lang="EN-GB" style="font-size:
10.0pt;font-family:Arial">Best regards,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span lang="EN-GB" style="font-size:
10.0pt;font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style="text-indent:35.4pt"><b><font size="2" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;font-weight:bold">Sylvain Reuzé
</span></font></b><span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:35.4pt"><font size="2" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial">Intern in medical physics</span></font><span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:35.4pt"><font size="2" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial">GUSTAVE ROUSSY</span></font><span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><font size="2" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial">Radiotherapy - Medical Physics Department<o:p></o:p></span></font></p>
<p class="MsoNormal" style="margin-left:35.4pt"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">Tél. : (+0033) 1 42 11 54 06</span></font><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:35.4pt"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial"><a href="http://www.gustaveroussy.fr/">www.gustaveroussy.fr</a></span></font><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:35.4pt"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial"><img border="0" width="300" height="155" id="_x0000_i1026" src="cid:image001.gif@01D0CF83.F569C740" align="baseline"><o:p></o:p></span></font></p>
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12.0pt"><o:p> </o:p></span></font></p>
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12.0pt"><o:p> </o:p></span></font></p>
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