<div dir="ltr"><div>Hi,</div><div>No, there isn't a way to estimate the convex hull. VTK probably offers something like that but I haven't used it. Note that from x-ray projections, you can threshold projections between air and object, backproject and threshold the volume to have an approximation of the convex hull.</div><div>Best regards,<br></div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 13, 2020 at 2:17 PM Andreas Andersen <<a href="mailto:andreasga22@gmail.com">andreasga22@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"><div dir="ltr">Hi Stephanie,<br>It depends on what you intend to compute more exactly:<br><br>If it's to remove values outside the scanners field of view, then the filter "rtk::FieldOfViewImageFilter" does exactly this. ( It uses the lpsolve library to do this: <a href="https://github.com/SimonRit/RTK/blob/master/include/rtkFieldOfViewImageFilter.hxx#L41" target="_blank">https://github.com/SimonRit/RTK/blob/master/include/rtkFieldOfViewImageFilter.hxx#L41</a> )<br><br>If it has anything to do with structures/delineations from DICOM, then wouldn't they already be the convex set?</div><div><br>ITK uses three formats for structures: labelmaps, mesh and polyline. But VTK has much better classes for this IMO, and may have what you need.<br>I don't think RTK has any direct use of any of the structure classes(?)</div><div><br></div><div>Best Regards<br>Andreas</div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><p style="margin-bottom:0.0001pt"><span style="color:rgb(31,73,125)" lang="EN-US"><span style="font-size:11pt;line-height:16.8667px;font-family:Calibri,sans-serif" lang="EN-US">__________________________________</span></span></p><p style="margin-bottom:0.0001pt"><span style="color:rgb(31,73,125)" lang="EN-US"><span style="font-size:11pt;line-height:16.8667px;font-family:Calibri,sans-serif" lang="EN-US">Andreas Gravgaard Andersen</span></span></p><p style="margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:"Times New Roman",serif;color:black"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Danish Center for Particle Therapy, </span></p><p style="margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:"Times New Roman",serif;color:black"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Aarhus University Hospital<u></u><u></u></span></p><p style="margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:"Times New Roman",serif;color:black"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)" lang="DA">Palle Juul-Jensens Blvd. 99,</span></p><p style="margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:"Times New Roman",serif;color:black"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)" lang="DA">8200, Aarhus</span></p><div><p style="margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:"Times New Roman",serif;color:black"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)" lang="DA">Mail: <a href="mailto:agravgaard@protonmail.com" target="_blank">agravgaard@protonmail.com</a></span></p><p style="margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:"Times New Roman",serif;color:black"><span style="color:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:11pt">Cell: </span><span style="color:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:11pt"> </span><a value="+4523382411" style="font-family:Calibri,sans-serif;font-size:11pt;color:rgb(17,85,204)">+45 3165 8140</a></p></div></div></div></div></div></div></div></div></div></div><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, 13 Jan 2020 at 09:46, Kaser, Stefanie <<a href="mailto:Stefanie.Kaser@oeaw.ac.at" target="_blank">Stefanie.Kaser@oeaw.ac.at</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 id="gmail-m_-5250035262619597146gmail-m_9009488989950289694divtagdefaultwrapper" dir="ltr" style="font-size:12pt;color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif,Helvetica,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols">
<p>Hello everyone,</p>
<p><br>
</p>
<p>I just wanted to bring up another question since I haven't found anything recent on the topic yet. Is it possible to calculate the convex hull of an object with ITK/RTK? If so, which are the crucial modules to use?</p>
<p><br>
</p>
<p>Best regards,</p>
<p>Stefanie</p>
</div>
</div>
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