<div dir="ltr">Hi Sveta,<div><br></div><div>I am using an STL file as a beam modifier for X-ray imaging, not as a radioactive source, though.</div><div><br></div><div>Howard</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Sep 23, 2019 at 3:26 AM Sveta <<a href="mailto:sveta@txcorp.com">sveta@txcorp.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Hi Howard,<div>Did you use an STL file with assigned activity? We have not found the setup with an STL as a source and ended up with a voxelized phantom instead. How did you do this? </div><div>Thanks,<br><br><div id="gmail-m_-1844987990053586937AppleMailSignature" dir="ltr">iSveta</div><div dir="ltr"><br>On Sep 23, 2019, at 3:26 AM, Howard <<a href="mailto:lomahu@gmail.com" target="_blank">lomahu@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div>Hi Catherine,</div><div><br></div><div>I am not using a voxelized phantom, but instead using a "tessellated" volume in the STL form. That might be the problem. But why did this not happen when I ran less events (2x10^7 events)? I am also wondering if the extra long simulation time (~6000 mins for a very simple CT imaging setup) is due to this? Thanks a lot for your help!</div><div><br></div><div>Howard<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Sep 22, 2019 at 10:07 PM Catherine Costa Oliveira da Silva <<a href="mailto:catherinecos@gmail.com" target="_blank">catherinecos@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr">Hi Howard,<div><br></div><div>I had the same problem as you. </div><div>If you are using a voxelized phantom with the setting "ImageRegularParametrisedVolume", try to change for "ImageNestedParametrisedVolume".</div><div><br></div><div>Best Regards,<br clear="all"><div><div dir="ltr" class="gmail-m_-1844987990053586937gmail-m_8013021243043101534gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><b>Catherine </b></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Em dom, 22 de set de 2019 às 22:48, Howard <<a href="mailto:lomahu@gmail.com" target="_blank">lomahu@gmail.com</a>> escreveu:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi Matthew and Svetlana,</div><div><br></div><div>Thank you for your replies. Can you a bit more specific about the production cuts? In the warning it says:</div><div><br></div><div>......<br></div><div>Trying pushing it of 1e-07 mm ...Potential overlap in geometry!</div><div><br></div><div>But I do not know what to change in my scripts though. I do not believe I have overlapping geometry since the same geometry was working totally fine when I tried to generate 2x10^7 events. Still confused.</div><div><br></div><div>Howard<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Sep 22, 2019 at 2:39 PM Matthew Strugari <<a href="mailto:matthew.strugari@dal.ca" target="_blank">matthew.strugari@dal.ca</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="auto">
Have you verified that your geometry is not overlapping?<br>
<br>
<div id="gmail-m_-1844987990053586937gmail-m_8013021243043101534gmail-m_-1235178884679917652gmail-m_-3480199993845806053AppleMailSignature" dir="ltr">Matthew</div>
<div dir="ltr"><br>
On Sep 22, 2019, at 2:14 PM, Svetlana Shasharina <<a href="mailto:sveta@txcorp.com" target="_blank">sveta@txcorp.com</a>> wrote:<br>
<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<p>Hi,</p>
<p>You would try to change production cuts to be a little bit bigger. <br>
</p>
<p>Best,</p>
<p>Svetlana<br>
</p>
<div>On 9/22/19 10:52 AM, Howard wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Hi,</div>
<div><br>
</div>
<div>I was simulating a X-ray imaging process with 2 x 10^9 events. It has been running over 5200 minutes and still ongoing. From the output I saw the following warning message about "Track stuck or not moving" as attached below (multiple times). However, when
I ran 2 x 10^7 events I did not have the same warming issue and the simulation was completed < 20 hours successfully. Should I worry about this warning or just ignore it and continue to wait? Thanks a lot!</div>
<div><br>
</div>
<div>Howard</div>
<br>
<div>-------- WWWW ------- G4Exception-START -------- WWWW -------<br>
*** G4Exception : GeomNav1002<br>
issued by : G4Navigator::ComputeStep()<br>
Track stuck or not moving.<br>
Track stuck, not moving for 10 steps<br>
in volume -world_phys- at point (-5.649999594721559,4.81816525126774,-38.09301491743752) (local point (-5.649999594721559,4.81816525126774,-38.09301491743752))<br>
direction: (0.6222482514791153,-0.3555437239478714,0.6974208011612956) (local direction: (0.6222482514791153,-0.3555437239478714,0.6974208011612956)).<br>
Potential geometry or navigation problem !<br>
Trying pushing it of 1e-07 mm ...Potential overlap in geometry!<br>
<br>
*** This is just a warning message. ***<br>
-------- WWWW -------- G4Exception-END --------- WWWW -------<br>
</div>
</div>
<br>
<fieldset></fieldset>
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