[Insight-users] interpreting registration-produced displacement fields

[Tim Bhatnagar]

Hi all,

Sorry for more questions about the directions of transformations..

Using a variation of the 'DeformableRegistration' example utilizing Demon's
algorithm, I use a 'deformed' image as my 'fixedInput', and a 'normal'
image for my 'movingInput'. I do this because I want to produce a
displacement field that when used with WarpImageFilter, could transform my
'normal' image to my 'deformed' image.

I hope this is right so far!

I'm trying to interpret/query the visualized displacement field (using
paraview), and I have already 'flipped' the x- and y- components each
displacement vector obtained at each voxel. Now, I would like to
query/determine the displacement vector at a point I identified on my
'normal image', which has an (x,y,z) position I can provide.

Should the (x,y,z) point from my 'normal' image correspond to a vector in
the displacement field - located at (x,y,z) of the displacement field data
-  that would allow me to determine the vector that took my point in the
normal image, (x,y,z), to its new location in the 'deformed' image,
(x,y,z)'?

Thanks so much for the help,

-- 
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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