<div dir="ltr">Hello, <div><br></div><div>in short : this is a known limitation, you cannot do that. </div><div><br></div><div>Indeed volumes cannot be overlapped (it is a G4 requirement). So if you insert a volume A (detector) within the bounds of a volume B (voxel), A must be child of B, and in this case the part of B within the A volume is not seen. </div><div><br></div><div>Possible workarounds : reduce the size of B so that A is outside or create A as voxels part of B. </div><div><br></div><div>I think that some groups (Brest) are currently working on an implementation of hybrid volumes that could allow such situation. I think it is not yet finished. </div><div><br></div><div>David</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Aug 24, 2016 at 9:15 PM, Francisco Pinto <span dir="ltr"><<a href="mailto:francisco.pinto@surgiceye.com" target="_blank">francisco.pinto@surgiceye.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p>Dear fellow Gate users,</p>
<p><br>
</p>
<p>I would be thankful to get some assistance with a current issue I'm facing. I am currently trying (and failing) to simulate the following scenario:</p>
<p>- A voxelized phantom defined via a CT dataset in Analyze format.</p>
<p>- A source placed inside the phantom.</p>
<p>- A simple detector aiming towards the source.</p>
<p><br>
</p>
<p>The problem I'm facing occurs when I place the detector inside the bounds of the voxelized phantom: When outside the bounds, the detector registers hits as expected. As soon as I move it inside the bounds, however, no hits are registered.</p>
<p><br>
</p>
<p>Is this a known limitation or am I doing something wrong? I'm using the latest develop Gate on Ubuntu 16.04, CPU-only single core simulation.<br>
</p>
<p>You may find all the relevant short scripts including the CT dataset here (17MB tgz):<a href="https://drive.google.com/open?id=0BzM9gTEQ3DYyYWFOcVRibklGdVk" target="_blank"> https://drive.google.com/open?<wbr>id=<wbr>0BzM9gTEQ3DYyYWFOcVRibklGdVk</a></p>
<p>Use runSim.sh to run the simulation (you may need to change the Gate binary's name in the script).<br>
</p>
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<p>If anyone has any tips or pointers, they would be very much appreciated.<br>
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<p>Cheers and thanks in advance,</p>
<p>Francisco<br>
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<div style="font-size:12pt;color:#000000;background-color:#ffffff;font-family:Calibri,Arial,Helvetica,sans-serif">
<p>Francisco Pinto</p>
<p><br>
</p>
<p>Principal Software Engineer<br>
SurgicEye GmbH<br>
Tel: +49 89 54 99 89 0 - 21<br>
</p>
</div>
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