[ITK] [ITK-users] How to get inverse diffeomorphic demons deformation field transform?

[Francois Budin]

Hello Mathew,

To my knowledge there is no way to get the inverse transform directly when
using ITKDiffeomorphicDemonsRegistrationFilter. You could try to invert the
deformation field using one of the algorithm that are available in ITK for
that purpose. It seems that you tried one (InverDisplacementField) but have
you tried the remote module [1]
If you want to get the inverse transformation directly, you can also try to
use [2] or use the registration method that has been implemented in this
Insight Journal paper [3].

Hope this helps,
Francois

[1]
https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Remote/FixedPointInverseDisplacementField.remote.cmake
[2]
https://itk.org/Doxygen/html/classitk_1_1VariationalSymmetricDiffeomorphicRegistrationFilter.html
[3] http://www.insight-journal.org/browse/publication/644

On Mon, May 22, 2017 at 3:25 PM, Mathew Guilfoyle <mrguilfoyle at gmail.com>
wrote:

> I am using (Simple)ITK DiffeomorphicDemonsRegistrationFilter() to perform
> deformable registration of two 3D images.  This works fine.  Output from
> the filter is 'outImage' vector image which I then convert to a transform
> using
>
> dfTransform = DisplacementFieldTransform(outImage).
>
> I can then resample my moving image using this transform and all looks as
> expected.
>
> My reading/understanding of diffeomorphic algorithms is that there should
> be an exact and readily computable inverse transform?  I need this as I
> want to inverse warp a template segmentation performed on my reference
> image into the original space of my moving image.  How do I obtain the
> inverse DisplacementFieldTransform or the inverse vector image?
>
> I have tried the InvertDisplacementField filter but the output of this
> does not appear to correctly invert my warped image back to the original so
> I do not think this filter generates is a n accurate inverse, at least
> using default settings.
>
> Any ideas of if/how I can get an exact inverse of a deformable transform?
>
> Thanks
>
>
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