<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /></head><body style='font-size: 10pt; font-family: Verdana,Geneva,sans-serif'>
<p>Dear Klara,</p>
<p>interesting! </p>
<p>Which Gate version are you using? e- production cuts? Max Step size limit? </p>
<p>" May there be some artefact because of calculation grid and phantom voxel size?" yes, that would be my first guess. Seems like is happening every 2-3 voxels, which can come from having a non constant number of geometric boundaries per scoring unit volume, e.g. if CT is 1.2695 mm spaced and calculation grid 2 mm, in the third calculation voxel there are two geometric boundaries, whereas in the first two are only one each. </p>
<p>best,</p>
<p>Andreas</p>
<p id="reply-intro">Am 2022-03-31 07:34, schrieb Klára Badraoui Čuprová:</p>
<blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0">
<div id="replybody1">
<style type="text/css">@font-face
{ font-family: "Cambria Math"; }
@font-face
{ font-family: Calibri; }
#replybody1 p.v1MsoNormal, #replybody1 li.v1MsoNormal, #replybody1 div.v1MsoNormal
{ margin: 0cm; margin-bottom: .0001pt; font-size: 11.0pt; font-family: "Calibri",sans-serif; mso-fareast-language: EN-US; }
#replybody1 a:link, #replybody1 span.v1MsoHyperlink
{ mso-style-priority: 99; color: #0563C1; text-decoration: underline; }
#replybody1 a:visited, #replybody1 span.v1MsoHyperlinkFollowed
{ mso-style-priority: 99; color: #954F72; text-decoration: underline; }
#replybody1 p
{ mso-style-priority: 99; mso-margin-top-alt: auto; margin-right: 0cm; mso-margin-bottom-alt: auto; margin-left: 0cm; font-size: 12.0pt; font-family: "Times New Roman",serif; }
#replybody1 p.v1xmsonormal, #replybody1 li.v1xmsonormal, #replybody1 div.v1xmsonormal
{ mso-style-name: x_msonormal; mso-style-priority: 99; margin: 0cm; margin-bottom: .0001pt; font-size: 12.0pt; font-family: "Times New Roman",serif; }
#replybody1 span.v1StylE-mailovZprvy19
{ mso-style-type: personal; font-family: "Calibri",sans-serif; color: windowtext; }
#replybody1 span.v1StylE-mailovZprvy20
{ mso-style-type: personal-reply; font-family: "Calibri",sans-serif; color: #1F497D; }
#replybody1 .v1MsoChpDefault
{ mso-style-type: export-only; font-size: 10.0pt; }
@page WordSection1
{ size: 612.0pt 792.0pt; margin: 70.85pt 70.85pt 70.85pt 70.85pt; }
#replybody1 div.v1WordSection1
{ }</style>
<div lang="CS">
<div class="v1WordSection1">
<p>Dear,</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.</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.)</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°).</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.</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?</p>
<p>I would be very grateful for help.</p>
<p>Best regards,</p>
<p>Klára Badraoui Čuprová</p>
<p class="v1MsoNormal"> </p>
<p class="v1xmsonormal"> </p>
<p class="v1xmsonormal"><span style="font-size: 10.5pt; color: black;">Ing. Klára Badraoui Čuprová, PhD.</span></p>
<p class="v1xmsonormal"><span style="font-size: 10.5pt; color: black;">Medical physicist</span></p>
<p class="v1xmsonormal"><span style="font-size: 10.5pt; color: black;"><img id="v1x_obrázek_x0020_1" src="cid:164871639062456a66cd2fa365170278@meduniwien.ac.at" alt="Popis: Popis: Popis: Popis: Popis: cid:1F7383A9-79F3-4EF6-AB2D-742C8E1A5D06" width="108" height="43" /></span></p>
<p class="v1xmsonormal"><span style="font-size: 10.5pt; color: black;"> </span></p>
<p class="v1xmsonormal"><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></p>
<p class="v1xmsonormal"><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></p>
<p class="v1xmsonormal"><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" rel="noreferrer"><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/" target="_blank" rel="noopener noreferrer"><span style="font-size: 10.0pt; font-family: 'Arial',sans-serif;">www.ptc.cz</span></a></span></p>
<p class="v1MsoNormal"> </p>
</div>
<br /><br />
<p class="v1MsoNormal"><em><span style="font-size: 8.0pt; line-height: 107%; font-family: 'Verdana','sans-serif'; color: #002060;">UPOZORNĚNÍ: Pokud jste obdrželi e-mailovou zprávu od Proton Therapy Center, jsou tato zpráva i veškeré přílohy zaslané společně s ní určeny výhradně pro potřeby adresáta a mohou obsahovat zákonem chráněné a důvěrné informace. Pokud nejste zamýšleným příjemcem zprávy nebo zaměstnancem či zástupcem odpovědným za doručení zprávy zamýšlenému příjemci, upozorňujeme Vás tímto, že jakékoliv šíření, distribuce, kopírování nebo jiné použití této zprávy či jejích příloh je přísně zakázáno. Pokud jste tuto zprávu obdrželi omylem, neprodleně o tom, prosím, informujte odesílatele odpovědí na tuto zprávu a poté tuto zprávu vymažte ze svého počítače.</span></em></p>
<br />
<p class="v1MsoNormal"><em><span style="font-size: 8.0pt; line-height: 107%; font-family: 'Verdana','sans-serif'; color: #002060;">WARNING: If you received this e-mail message from Proton Therapy Center, please note that this message and all attachments sent with it are intended solely for the needs of the addressee and may contain proprietary and confidential information. If you are not the intended recipient, or an employee or agent responsible for delivering the messageto the intended recipient, please note that that any dissemination, distribution, copying or other use of this message or its attachments is strictly prohibited. If you have received this message in error, please notify the sender of this message and then delete this message from your computer.</span></em></p>
</div>
</div>
<br />
<div class="pre" style="margin: 0; padding: 0; font-family: monospace">_______________________________________________<br />Gate-users mailing list<br /><a href="mailto:Gate-users@lists.opengatecollaboration.org">Gate-users@lists.opengatecollaboration.org</a><br /><a href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users" target="_blank" rel="noopener noreferrer">http://lists.opengatecollaboration.org/mailman/listinfo/gate-users</a></div>
</blockquote>
</body></html>