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

[Francois Budin]

Thanks Brad. I updated our scripts.

Francois

On Wed, May 24, 2017 at 9:34 AM, Lowekamp, Bradley (NIH/NLM/LHC) [C] <
blowekamp at mail.nih.gov> wrote:

> I think it is this build:
>
> https://open.cdash.org/viewNotes.php?buildid=4911206
>
> It looks like the remote modules need to manually enabled in the
> configuration.
>
> Brad
>
> On May 24, 2017, at 12:06 AM, Francois Budin <francois.budin at kitware.com>
> wrote:
>
> Hey Brad,
>
> I actually do not know when the remote module documentation is generated.
> CC'ing Matt.
>
> Francois
>
> On Tue, May 23, 2017 at 2:59 PM, Lowekamp, Bradley (NIH/NLM/LHC) [C] <
> blowekamp at mail.nih.gov> wrote:
>
>> Francois,
>>
>> There does not seem to be a Doxygen page for FixedPointInverseDisplacementFieldImageFilter.
>> I thought all remote modules were suppose to be in Doxygen. Do you have any
>> idea why?
>>
>> Brad
>>
>> On May 22, 2017, at 4:00 PM, Francois Budin <francois.budin at kitware.com>
>> wrote:
>>
>> 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_1VariationalSymm
>> etricDiffeomorphicRegistrationFilter.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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>
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