[Insight-users] preparing images for DeformableRegistration15

[Tim Bhatnagar]

Hello again,

I have reformatted my input images into vtk format, which facilitates
easier qualitative comparison of inputs and outputs in paraview.

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?

Thanks,

On Tue, Jun 5, 2012 at 10:56 AM, Tim Bhatnagar <tim.bhatnagar at gmail.com>wrote:

> Hello all,
>
> 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.
>
> 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..
>
> Thanks,
>
> --
> Tim Bhatnagar
> PhD Candidate
> Orthopaedic Injury Biomechanics Group
> Department of Mechanical Engineering
> University of British Columbia
>
> Rm 5000 - 818 West 10th Ave.
> Vancouver, BC
> Canada
> V5Z 1M9
>
> Ph: (604) 675-8845
> Fax: (604) 675-8820
> Web: oibg.mech.ubc.ca
>
>


-- 
Tim Bhatnagar
PhD Candidate
Orthopaedic Injury Biomechanics Group
Department of Mechanical Engineering
University of British Columbia

Rm 5000 - 818 West 10th Ave.
Vancouver, BC
Canada
V5Z 1M9

Ph: (604) 675-8845
Fax: (604) 675-8820
Web: oibg.mech.ubc.ca
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