[Insight-users] Demons Deformable Registration and Paraview

[Tim Bhatnagar]

Hello all,

Has anyone used Paraview to visualize Deformable Registration Displacement
fields in Paraview? I am having trouble verifying what exactly paraview is
showing me. A point (x,y,z) where I know a large y-deformation occurs does
not exhibit that vector magnitude in Paraview, but it DOES seem to exist at
a spatial coordinate that corresponds to where the large deformation ENDS
(ie where the (x,y,z) point is located AFTER registration).

Between this, and 'flipping' the x- and y- components of the vectors in the
displacement field, I have managed to become very confused about the proper
way to visualize the data.

Note that after using WarpImageFilter with my registration-produced
displacement field, I get the registered output I was looking for (yay!).
It's just visualizing the proper deformation field for visual/qualitative
figures is completely eluding me.

Any help is greatly appreciated, though I feel like my emails in this
user-list not up to par in terms of how I describe my problem, or the
information I pass along is not enough to have an experienced ITKer chime
in. If this is the case, please tell me what other info you need,as I'm
happy to provide it.

Alternatively, if it's best I address this to a Paraview-users community, I
can try that. I just figured anyone who used Demons in ITK would most
likely also visualize the field..

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
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