<div><div>Hi Lars,<br>I did some work about it, but we used the nose bridge and the eyes cavities.<br>We computed the principle curvatures a mesh extracted from the mri images and then applying several heuristic rules to find our landmarks.
<br>I assume that your work is similar to us.<br>However we did not use ITK, but VTK which have methods to compute the curvatures on a mesh.<br>You can try it.<br>good luck,<br>Moti<br><br> </div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Message: 2<br>Date: Tue, 24 Jul 2007 05:02:25 -0700 (PDT)<br>From: Lars Nygard <<a href="mailto:lnygard@yahoo.com">lnygard@yahoo.com</a>><br>Subject: [Insight-users] Anatomical Landmarks in MRI data<br>To: <a href="mailto:insight-users@itk.org">
insight-users@itk.org</a><br>Message-ID: <<a href="mailto:129558.11270.qm@web50201.mail.re2.yahoo.com">129558.11270.qm@web50201.mail.re2.yahoo.com</a>><br>Content-Type: text/plain; charset=iso-8859-1<br><br>Hi all,<br>
<br>Im starting on this project where I have to extract characteristic<br>anatomical landmarks in MRI data. Suitable candidates would<br>be:<br> 1. the nasion, defined as the most posterior midpoint of<br> the root of the nose.
<br> 2. The most posterior point of the rim of the posterior wall of the<br> external acoustic meatus<br> 3. A point of the lateral canthus, defined as frontal to the orbital<br> margin of the zygomatic bone
<br><br>Maybe a bit difficult descpription but the goal is that you can point to<br>these spots on the patient (lying on the operation table) with a optic<br>pointing device. Then the algorithm should find these points in order to
<br>do the registration of pre-operative MRI images to the operation table.<br>Has anybody worked with this and what are the options availabe in ITK<br>to find these (or other) characteristics points?<br>thanks for any advice,
<br>regards,<br>Lars Nygard<br><br><br><br>_________________________________________________________<br>Alt i én. Få Yahoo! Mail med adressekartotek, kalender og<br>notisblokk. <a href="http://no.mail.yahoo.com">http://no.mail.yahoo.com
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http://www.itk.org/mailman/listinfo/insight-users</a><br><br><br>End of Insight-users Digest, Vol 39, Issue 57<br>*********************************************<br></blockquote></div><br><br clear="all"><br>-- <br>__<br>Moti Freiman,
Ph.D Student.<br>Medical Image Processing and Computer-Assisted Surgery Laboratory.<br>School of Computer Science and Engineering.<br>The Hebrew University of Jerusalem Givat Ram, Jerusalem 91904, Israel<br>Phone: +(972)-2-658-5371 (laboratory)
<br>WWW site: <a href="http://www.cs.huji.ac.il/~freiman">http://www.cs.huji.ac.il/~freiman</a>