<div dir="ltr"><div>Hi Hojjat Mahani,<br><br></div>I also had the same problem. My suggestion is to define very small dimensions for the volume box:<br><div><div><div><div><br>/gate/world/daughters/name collimator<br> /gate/world/daughters/insert trpd<br> /gate/collimator/geometry/setX1Length 10 cm<br><div id=":w0"> /gate/collimator/geometry/setY1Length 5 cm<br> /gate/collimator/geometry/setX2Length 10 cm<br> /gate/collimator/geometry/setY2Length 1 cm<br> /gate/collimator/geometry/setZLength ?3.0 ?cm<br><br></div><div id=":w0">## These are Gate V.5 commands, I think they are still avaible in V.6<br></div><div id=":w0">/gate/collimator/geometry/setXBoxLength 0.001 mm<br>/gate/collimator/geometry/setYBoxLength 0.001 mm<br> /gate/collimator/geometry/setZBoxLength 0.001 mm<br><br> /gate/collimator/setMaterial Lead<br> /gate/collimator/vis/setColor red<br> /gate/collimator/vis/forceWireframe<br><br></div><div id=":w0">That's a strange solution but I believe it will solve your problem. <br><br></div><div id=":w0">Best regards,<br></div><br>-------------------------------------------------------------------<br> Ricardo Capote<br><div> <br> <span lang="en"><span>Institute</span> <span>of Biophysics and</span> <span>Biomedical Engineering</span><br> <span>Faculty</span> <span>of Science, University</span> <span>of Lisbon</span></span><br> Campo Grande<br> 1749-016 Lisbon<br> <br> Tel. <a value="+351217500177">+ 351 21 750 01 77</a>; Fax: <a value="+351217500030">+ 351 21 750 00 30</a><br> Extension: 20510<br> Email: <a href="mailto:rmcapote@fc.ul.pt" target="_blank">rmcapote@fc.ul.pt</a><br>Website: <a href="http://www.ibeb.fc.ul.pt/" target="_blank">http://www.ibeb.fc.ul.pt/</a></div><br><br><div style id="__af745f8f43-e961-4b88-8424-80b67790c964__"> </div><div class="gmail_extra"><br><br><div class="gmail_quote">2013/11/11 <span dir="ltr"><<a href="mailto:gate-users-request@lists.opengatecollaboration.org" target="_blank">gate-users-request@lists.opengatecollaboration.org</a>></span><br> <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Send Gate-users mailing list submissions to<br> <a href="mailto:gate-users@lists.opengatecollaboration.org">gate-users@lists.opengatecollaboration.org</a><br> <br> To subscribe or unsubscribe via the World Wide Web, visit<br> <a href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users" target="_blank">http://lists.opengatecollaboration.org/mailman/listinfo/gate-users</a><br> or, via email, send a message with subject or body 'help' to<br> <a href="mailto:gate-users-request@lists.opengatecollaboration.org">gate-users-request@lists.opengatecollaboration.org</a><br> <br> You can reach the person managing the list at<br> <a href="mailto:gate-users-owner@lists.opengatecollaboration.org">gate-users-owner@lists.opengatecollaboration.org</a><br> <br> When replying, please edit your Subject line so it is more specific<br> than "Re: Contents of Gate-users digest..."<br> <br> <br> Today's Topics:<br> <br> 1. Problem in modeling a trapezoid (Hojjat Mahani)<br> <br> <br> ----------------------------------------------------------------------<br> <br> Message: 1<br> Date: Sun, 10 Nov 2013 22:27:21 -0800 (PST)<br> From: Hojjat Mahani <<a href="mailto:hojjat.mahani@yahoo.com">hojjat.mahani@yahoo.com</a>><br> To: GATErs <<a href="mailto:gate-users@lists.opengatecollaboration.org">gate-users@lists.opengatecollaboration.org</a>><br> Subject: [Gate-users] Problem in modeling a trapezoid<br> Message-ID:<br> <<a href="mailto:1384151241.75100.YahooMailNeo@web161006.mail.bf1.yahoo.com">1384151241.75100.YahooMailNeo@web161006.mail.bf1.yahoo.com</a>><br> Content-Type: text/plain; charset="iso-8859-1"<br> <br> Dear GATE users,<br> <br> I have modeled a trapezoid as the collimator in my SPECT simulation.?<br> Everything seems to be right, but, I have faced an unexpected problem: an extra volume exists inside the trapezoid (as shown in attached figure).<br> <br> Here are the commands used to define aforementioned trapezoid:<br> <br> # Collimator (Trapezoidal Collimator)<br> /gate/world/daughters/name collimator<br> /gate/world/daughters/insert trpd<br> /gate/collimator/geometry/setX1Length 10 cm<br> /gate/collimator/geometry/setY1Length 5 cm<br> /gate/collimator/geometry/setX2Length 10 cm<br> /gate/collimator/geometry/setY2Length 1 cm<br> /gate/collimator/geometry/setZLength ?3.0 ?cm<br> /gate/collimator/setMaterial Lead<br> /gate/collimator/vis/setColor red<br> /gate/collimator/vis/forceWireframe<br> <br> Any suggestion or idea would be appreciated; thank you in advance.<br> <br> ?<br> <br> Hojjat Mahani,<br> PhD Candidate of Medical Radiation Engineering.<br> -------------- next part --------------<br> An HTML attachment was scrubbed...<br> URL: <<a href="http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20131110/6f8feebb/attachment-0001.html" target="_blank">http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20131110/6f8feebb/attachment-0001.html</a>><br> -------------- next part --------------<br> A non-text attachment was scrubbed...<br> Name: Trapezoid.png<br> Type: image/png<br> Size: 7263 bytes<br> Desc: not available<br> URL: <<a href="http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20131110/6f8feebb/attachment-0001.png" target="_blank">http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20131110/6f8feebb/attachment-0001.png</a>><br> <br> ------------------------------<br> <br> _______________________________________________<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">http://lists.opengatecollaboration.org/mailman/listinfo/gate-users</a><br> <br> End of Gate-users Digest, Vol 90, Issue 4<br> *****************************************<br> </blockquote></div><br></div></div></div></div></div></div>