<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">If the results of your segmentation was just labeled pixels, you may consider a level-set representation to obtain a sub-pixel representation of the surface. This could be a completed simply by smoothing the mask with a filter such as CurvatureFlowImageFilter, or refining the segmentation with a filter such as LaplacianSegmentationLevelSetImageFilter.<div><br></div><div><br><div><div>On Mar 21, 2012, at 6:07 AM, Dženan Zukić wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><font><font face="verdana,sans-serif">You can <a href="http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/ResampleImageFilter">resample</a> the image, or use linear <a href="http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/LinearInterpolateImageFunction">interpolator</a>.<br>
</font></font><br><div class="gmail_quote">On Tue, Mar 20, 2012 at 14:07, Xiaopeng Yang <span dir="ltr"><<a href="mailto:yxp233@postech.ac.kr">yxp233@postech.ac.kr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<u></u><u></u><div lang="EN-US" link="blue" vlink="purple" style="margin-left:3.0pt;margin-top:3.0pt;margin-right:3.0pt;margin-bottom:.75pt"><div><div><p class="MsoNormal"><span style="color:#1f497d">Hi Kent,<u></u><u></u></span></p><p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="color:#1f497d">Do you know any interpolate class in ITK which can generate more slices? For volumetry, I guess I can use the original data.<u></u><u></u></span></p><p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="color:#1f497d">Thanks,<u></u><u></u></span></p><p class="MsoNormal"><span style="color:#1f497d">Xiaopeng</span><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u><u></u></span></p>
</div><p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Kent Ogden [mailto:<a href="mailto:ogdenk@upstate.edu" target="_blank">ogdenk@upstate.edu</a>] <br>
<b>Sent:</b> Tuesday, March 20, 2012 9:50 PM<br><b>To:</b> <a href="mailto:insight-users@itk.org" target="_blank">insight-users@itk.org</a>; Xiaopeng Yang</span></p><div class="im"><br><b>Subject:</b> Re: [Insight-users] How to smooth the segmented surface<u></u><u></u></div><div><br class="webkit-block-placeholder"></div></div></div><p class="MsoNormal"><u></u> <u></u></p><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; "><span style="font-size:18.0pt">Xiaopeng,</span> <u></u><u></u></div><div class="im"><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><u></u> <u></u></span></p><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; "><span style="font-size:18.0pt">This is a fundamental limitation of your data that can only truly be solved by reconstructing thinner slices at the time of the scan. You could interpolate between images to generate more slices, which would result in a smoother looking rendering. If you are trying to make quantitative measurements (e.g. volume) you must be careful about these kinds of manipulations though.</span> <u></u><u></u></div><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><u></u> <u></u></span></p><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; "><span style="font-size:18.0pt">Kent</span> <u></u><u></u></div><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><u></u> <u></u></span></p><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; "><br><br>>>> "Xiaopeng Yang" <<a href="mailto:yxp233@postech.ac.kr" target="_blank">yxp233@postech.ac.kr</a>> 3/19/2012 10:17 PM >>><u></u><u></u></div>
</div><div><p class="MsoNormal">Dear Users, <u></u><u></u></p><div><div class="h5"><p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal">I have tried to segment the liver from 5 mm CT slices. When I tried to visualize the segmented liver in 3D, I found that the surface of the 3D liver was discrete, just like stairs. I guess that is because of the 5 mm interval between CT slices. Do you guys have any good idea how to make the 3D surface of the liver look continuous and smooth? <u></u><u></u></p><p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal">Thanks, <u></u><u></u></p><p class="MsoNormal">Xiaopeng <u></u><u></u></p></div></div></div></div></div><br>_____________________________________<br>
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