<div dir="ltr"><div><div>Hey Brad,<br><br></div>I actually do not know when the remote module documentation is generated. CC'ing Matt.<br><br></div>Francois<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, May 23, 2017 at 2:59 PM, Lowekamp, Bradley (NIH/NLM/LHC) [C] <span dir="ltr"><<a href="mailto:blowekamp@mail.nih.gov" target="_blank">blowekamp@mail.nih.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">



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Francois,
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<div>There does not seem to be a Doxygen page for <wbr>FixedPointInverseDisplacementF<wbr>ieldImageFilter. I thought all remote modules were suppose to be in Doxygen. Do you have any idea why?</div>
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<div>Brad</div><div><div class="h5">
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<div>On May 22, 2017, at 4:00 PM, Francois Budin <<a href="mailto:francois.budin@kitware.com" target="_blank">francois.budin@kitware.com</a>> wrote:</div>
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<div>Hello Mathew,<br>
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To my knowledge there is no way to get the inverse transform directly when using ITKDiffeomorphicDemonsRegistra<wbr>tionFilter. 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]<br>
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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].<br>
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Hope this helps,<br>
</div>
Francois<br>
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[1]<span class="m_935995448879633811Apple-converted-space"> </span><a href="https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Remote/FixedPointInverseDisplacementField.remote.cmake" target="_blank">https://github.com/<wbr>InsightSoftwareConsortium/ITK/<wbr>blob/master/Modules/Remote/<wbr>FixedPointInverseDisplacementF<wbr>ield.remote.cmake</a><br>
[2]<span class="m_935995448879633811Apple-converted-space"> </span><a href="https://itk.org/Doxygen/html/classitk_1_1VariationalSymmetricDiffeomorphicRegistrationFilter.html" target="_blank">https://itk.org/Doxygen/<wbr>html/classitk_1_<wbr>1VariationalSymmetricDiffeomor<wbr>phicRegistrationFilter.html</a><br>
[3]<span class="m_935995448879633811Apple-converted-space"> </span><a href="http://www.insight-journal.org/browse/publication/644" target="_blank">http://www.insight-<wbr>journal.org/browse/<wbr>publication/644</a><br>
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<div class="gmail_quote">On Mon, May 22, 2017 at 3:25 PM, Mathew Guilfoyle<span class="m_935995448879633811Apple-converted-space"> </span><span dir="ltr"><<a href="mailto:mrguilfoyle@gmail.com" target="_blank">mrguilfoyle@gmail.<wbr>com</a>></span><span class="m_935995448879633811Apple-converted-space"> </span>wrote:<br>
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I am using (Simple)ITK DiffeomorphicDemonsRegistratio<wbr>nFilter() 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<br>
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dfTransform = DisplacementFieldTransform(out<wbr>Image).<br>
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I can then resample my moving image using this transform and all looks as expected.<br>
<br>
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?<br>
<br>
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.<br>
<br>
Any ideas of if/how I can get an exact inverse of a deformable transform?<br>
<br>
Thanks<br>
<br>
<br>
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