[Insight-users] question regarding registration outputs

[Tim Bhatnagar]

perhaps for context, I should include an example of what I am trying to
register. I've included two corresponding slices (of 48 slice volumes) that
are to be registered (the one on the right is the 'deformed' image, as can
be seen.

Thanks again,




On Wed, Oct 9, 2013 at 10:59 AM, Tim Bhatnagar <tim.bhatnagar at gmail.com>wrote:

> 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
>



-- 
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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