[Insight-users] question regarding registration outputs

[Tim Bhatnagar]

Thanks Matt,

It is strange then, that I can extract data from the displacement field
that seems to represent the field that would transform the
'pre-deformation' image into the 'deformation' image. (There is a
significant deformation in the 'deformation data' in the negative
y-direction, which shows up nicely in the displacement field.

Must I be doing something strange for this to happen?


On Wed, Oct 9, 2013 at 10:31 AM, Matt McCormick
<matt.mccormick at kitware.com>wrote:

> Hi Tim,
>
> No, the WarpImageFilter should be generating a 'pre-deformation'
> look-alike.  For more information, see the Software Guide.
>
> HTH,
> Matt
>
> On Wed, Oct 9, 2013 at 4:48 PM, Tim Bhatnagar <tim.bhatnagar at gmail.com>
> wrote:
> > Hello all,
> >
> > I use the ITK examples ImageRegistration5, ImageRegistration8 and
> > DeformableRegistration2 (Demon's) for registration of normal and deformed
> > data (same subject). Briefly, I do some pre-registration of my data using
> > ImageReg5 and ImageReg8 (for gross alignment), after which I take the
> > produced displacement fields, and use them as the 'initial displacement
> > field' for DefReg2.
> >
> > In all cases, I am using my 'pre-deformation' data as my fixed source,
> and
> > my 'deformation' data as my moving source.
> >
> > I have some fiducial markers to check the accuracy of the generated
> > displacement field, and it looks pretty good. However, when trying to
> > produce figures, my registration output looks much closer to my
> > 'deformation' data, and sometimes the output and the actual 'deformation'
> > data are offset by a magnitude.
> >
> > In my situation, should I be aiming to have my registration output appear
> > similar to my 'pre-deformation' data? (I get confused reading the ITK
> > explanation on that) Shouldn't I be able to produce the a 'deformation'
> > look-a-like by using WarpImageFilter with my 'pre-deformation' data and
> my
> > generated displacement field?
> >
> > Sorry this was so wordy. Any help would be much appreciated.
> >
> > --
> > 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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>



-- 
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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