Hello again,<br><br>I have reformatted my input images into vtk format, which facilitates easier qualitative comparison of inputs and outputs in paraview.<br><br>However, I am no longer having ANY iterative steps during the gross and fine deformable registration methods... almost like the metric is already minimized? I have no idea why one image format input (hdr) would facilitate deformable registration steps, but now vtk-format does not... any ideas?<br>
<br>Thanks,<br><br><div class="gmail_quote">On Tue, Jun 5, 2012 at 10:56 AM, Tim Bhatnagar <span dir="ltr"><<a href="mailto:tim.bhatnagar@gmail.com" target="_blank">tim.bhatnagar@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hello all,<br><br>I have two sets of Nifti-Analyze (*.hdr and disc image files) images (~48x48 pixels x 48 slices, 16-bit unsigned), of before and after an applied tissue deformation. I segmented the tissue of interest from the rest of the image data, and thresholded the images so only the tissue pixels are non-zero. I have used DeformableRegistration15 to determine the deformation field that transforms from undeformed->deformed states. The registration runs well (I changed the '# of coarse b-spline grid nodes to 8, and the '# of fine b-spline grid nodes to 12', in hopes of being able to accurately determine a large strain in a very localized region), but the deformation field just looks off - most notably, the largest deformations I'm seeing (using Paraview) occur in the zero-pixel (non-tissue) portions of the field. All of the output image data from the algorithm has been designed to be vtk files so I can use paraview.<br>
<br>Are there any key steps I'm missing here? I can give a further description/data if needed, but I'm wondering if I've missed a basic point somewhere along the way..<br><br>Thanks,<br clear="all"><br>-- <br>
Tim Bhatnagar<br>PhD Candidate<br>Orthopaedic Injury Biomechanics Group<br>Department of Mechanical Engineering<br>University of British Columbia<br><br>Rm 5000 - 818 West 10th Ave.<br>Vancouver, BC<br>Canada<br>V5Z 1M9<br>
<br>Ph: <a href="tel:%28604%29%20675-8845" value="+16046758845" target="_blank">(604) 675-8845</a><br>Fax: <a href="tel:%28604%29%20675-8820" value="+16046758820" target="_blank">(604) 675-8820</a><br>Web: <a href="http://oibg.mech.ubc.ca" target="_blank">oibg.mech.ubc.ca</a><br>
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</blockquote></div><br><br clear="all"><br>-- <br>Tim Bhatnagar<br>PhD Candidate<br>Orthopaedic Injury Biomechanics Group<br>Department of Mechanical Engineering<br>University of British Columbia<br><br>Rm 5000 - 818 West 10th Ave.<br>
Vancouver, BC<br>Canada<br>V5Z 1M9<br><br>Ph: (604) 675-8845<br>Fax: (604) 675-8820<br>Web: <a href="http://oibg.mech.ubc.ca" target="_blank">oibg.mech.ubc.ca</a><br><br>