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<p>Dear,<o:p></o:p></p>
<p>I am medical physicist in Proton Therapy Center in Czech and I am concerned with Monte Carlo simulations in GATE for proton therapy.<o:p></o:p></p>
<p>I calculate dose and LET distributions in patients and in some patients I get strange results for LETdistributions. (Dose distributions are all OK.)<o:p></o:p></p>
<p>In some LET distributions a line pattern appears (I am attaching printscreen). (The patients with such problem are irradiated from main angles (0°,90° or 270°).
<o:p></o:p></p>
<p>Calculation of LET to water phantom was OK. May there be some artefact because of calculation grid and phantom voxel size? Calculation grid is 2mmx2mmx2mm.
<o:p></o:p></p>
<p>Voxel phantom of one particular prostatic patient is of size 1.2695mm, 1.2695mm, 2mm. Please, do you have some idea why this happens?<o:p></o:p></p>
<p>I would be very grateful for help. <o:p></o:p></p>
<p>Best regards, <o:p></o:p></p>
<p>Klára Badraoui Čuprová<o:p></o:p></p>
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<p class="xmsonormal"><span style="font-size:10.5pt;color:black">Ing. Klára Badraoui Čuprová, PhD.</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:10.5pt;color:black">Medical physicist</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:10.5pt;color:black"><img width="108" height="43" id="x_obrázek_x0020_1" src="cid:image001.png@01D8436E.B93FCF60" alt="Popis: Popis: Popis: Popis: Popis: cid:1F7383A9-79F3-4EF6-AB2D-742C8E1A5D06"></span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:10.5pt;color:black"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Proton Therapy Center Czech s.r.o., Křenova 11, CZ–162 00 Praha 6</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Zapsáno v OR u MS Praha, odd. C, 84153, IČ 26466791, DIČ CZ26466791</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">telefon +420 222 998 941 </span><span style="color:#1F497D"><a href="mailto:info@ptc.cz"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">info@ptc.cz</span></a></span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">, </span><span style="color:#1F497D"><a href="https://_neklikaci-odkaz_/http:/www.ptc.cz/"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">www.ptc.cz</span></a></span><o:p></o:p></p>
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