[Vv] Using vv/CLITK and elastix to compute target registration error

[Bilal Tahir]

Dear Stefan,

It works perfectly. Thank you very much.

All the best,

Bilal

On 20 March 2013 18:52, S. Klein <s.klein at erasmusmc.nl> wrote:

>  Hi Bilal,
> I would do it like this:
> 1) ask your radiologists to click corresponding points in the ORIGINAL
> fixed and moving images. This gives you two files: fixedpoints.txt and
> movingpoints.txt.
> 2) Run elastix: elastix -f fixed -m moving -p parameterfile -out outdir
> 3) Run transformix to transform the FIXED points: transformix -def
> fixedpoints.txt -tp outdir/TransformParameters.0.txt -out outdir
> 4) now compare the transformed fixed points (which are stored in
> outdir/outputpoints.txt) to the original moving points.
>
> Instead of using the custom elastix input and output point formats (see
> elastix manual, section on transformix), you could also use .vtk (in legacy
> asci vtk format).
>
> Since the transformation is defined as a mapping from the fixed image
> domain to the moving image domain, you can only directly transform points
> from fixed to moving image.
>
> Kind regards,
> Stefan
>
>
> On 20/03/2013 19:06, Bilal Tahir wrote:
>
> Dear VV community,
>
>  We are planning to get a radiologist to define corresponding landmarks
> on fixed/moving inspiration/expiration CT lung images using VV. We use
> elastix for image registration. Once the registration is performed, is it
> possible to use VV/CLITK to compute the target registration error (TRE)
> between the fixed image landmarks and the registered moving image landmarks?
>
>  Furthermore, we would like the landmarks to be defined on the moving
> image prior to registration so that we can try different parameters to
> assess which gives the best TRE. Perhaps this is outside the scope of the
> mailbase, but has anyone done something similar using Elastix, where the
> coordinates of the expert landmarks are defined prior to registration using
> VV and new coordinates computed depending on the registration algorithm?
>
>  Best wishes,
>
> Bilal Tahir,
> James Morrison Researcher in Radiotherapy Imaging
>
>
> _______________________________________________
> vv mailing listvv at creatis.insa-lyon.frhttp://www.creatis.insa-lyon.fr/mailman/listinfo/vv
>
>
> --
> Stefan Klein+31 10 7043049http://www.bigr.nl/people/StefanKlein
>
>


-- 
Bilal Tahir,
James Morrison Researcher in Radiotherapy Imaging
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