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    <font size="-1">Hi Sylvain,<br>
      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).<br>
      Hope it helps to answer your questions.<br>
      If something is not clear, don't hesitate to send me a mail.<br>
      Best regards,<br>
      Nicolas Arbor<br>
    </font>
    <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">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 :<br>
    </div>
    <blockquote
cite="mid:B3429882877FFB44A20845EC89FF299174C4FFB3@SRV-MBX-02.intra.igr.fr"
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        <p class="MsoNormal"><font face="Arial" size="2"><span
              style="font-size:10.0pt;
              font-family:Arial">Dear Gate users,<o:p></o:p></span></font></p>
        <p class="MsoNormal"><font face="Arial" size="2"><span
              style="font-size:10.0pt;
              font-family:Arial"><o:p> </o:p></span></font></p>
        <p class="MsoNormal"><font face="Arial" size="2"><span
              style="font-size:
              10.0pt;font-family:Arial" lang="EN-GB">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 face="Arial" size="2"><span
              style="font-size:
              10.0pt;font-family:Arial" lang="EN-GB">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 face="Arial" size="2"><span
              style="font-size:
              10.0pt;font-family:Arial" lang="EN-GB"><o:p> </o:p></span></font></p>
        <p class="MsoNormal"><font face="Arial" size="2"><span
              style="font-size:
              10.0pt;font-family:Arial" lang="EN-GB">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 face="Arial" size="2"><span
              style="font-size:
              10.0pt;font-family:Arial" lang="EN-GB"><o:p> </o:p></span></font></p>
        <p class="MsoNormal"><font face="Arial" size="2"><span
              style="font-size:
              10.0pt;font-family:Arial" lang="EN-GB">And when I try to
              use dose squared and dose with a formula (Visvikis et al.:
              <a moz-do-not-send="true"
                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 face="Arial" size="2"><span
              style="font-size:
              10.0pt;font-family:Arial" lang="EN-GB"><o:p> </o:p></span></font></p>
        <p class="MsoNormal"><font face="Arial" size="2"><span
              style="font-size:
              10.0pt;font-family:Arial" lang="EN-GB">Could you help me ?<o:p></o:p></span></font></p>
        <p class="MsoNormal"><font face="Arial" size="2"><span
              style="font-size:
              10.0pt;font-family:Arial" lang="EN-GB"><o:p> </o:p></span></font></p>
        <p class="MsoNormal"><font face="Arial" size="2"><span
              style="font-size:
              10.0pt;font-family:Arial" lang="EN-GB">Best regards,<o:p></o:p></span></font></p>
        <p class="MsoNormal"><font face="Arial" size="2"><span
              style="font-size:
              10.0pt;font-family:Arial" lang="EN-GB"><o:p> </o:p></span></font></p>
        <p class="MsoNormal" style="text-indent:35.4pt"><b><font
              face="Arial" size="2"><span
                style="font-size:10.0pt;font-family:Arial;font-weight:bold"
                lang="EN-GB">Sylvain Reuzé
              </span></font></b><span lang="EN-GB"><o:p></o:p></span></p>
        <p class="MsoNormal" style="text-indent:35.4pt"><font
            face="Arial" size="2"><span
              style="font-size:10.0pt;font-family:Arial" lang="EN-GB">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
            face="Arial" size="2"><span
              style="font-size:10.0pt;font-family:Arial" lang="EN-GB">GUSTAVE
              ROUSSY</span></font><span lang="EN-GB"><o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:35.4pt"><font
            face="Arial" size="2"><span
              style="font-size:10.0pt;font-family:Arial" lang="EN-GB">Radiotherapy
              - Medical Physics Department<o:p></o:p></span></font></p>
        <p class="MsoNormal" style="margin-left:35.4pt"><font
            face="Arial" size="2"><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
            face="Arial" size="2"><span
              style="font-size:10.0pt;font-family:Arial"><a
                moz-do-not-send="true"
                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
            face="Arial" size="2"><span
              style="font-size:10.0pt;font-family:Arial"><img
                id="_x0000_i1026"
                src="cid:part3.02000204.08040101@iphc.cnrs.fr"
                border="0" align="bottom" height="155" width="300"><o:p></o:p></span></font></p>
        <p class="MsoNormal"><font face="Times New Roman" size="3"><span
              style="font-size:
              12.0pt"><o:p> </o:p></span></font></p>
        <p class="MsoNormal"><font face="Times New Roman" size="3"><span
              style="font-size:
              12.0pt"><o:p> </o:p></span></font></p>
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      <pre wrap="">_______________________________________________
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