[Insight-users] Re: [Paraview] 3D Deformable Registration Deformation Field

[Luis Ibanez]

Hi Kevin,

Could you please post in a web site a screenshot of the
visualization of your deformation field ?

It is hard, from your verbal description, to understand what
is going on with the registration/visualization.


You may want to take a look at the ITK Software Guide:

      http://www.itk.org/ItkSoftwareGuide.pdf

in Section 8.15.2 "Visualizing 3D Deformation Fields",
PDF-page 502 (Book page 470) there is a description on how
to use ParaView in order to visualize the 3D displacement
field resulting from a deformable registration method.

Note that you must pay particular attention to the pixel
size of your images and the scaling that you use for the
Glyphs inside ParaView.

If computed correctly, the vector of your displacement
field should be measured in the *same* units as the
pixel spacing is defined in your input images.



     Regards,



         Luis



------------------
Kevin Ming wrote:
> Hi,
> 
> I was able to get a deformation field output from my 3D deformable 
> registration, but it's not what I was expecting to see:  There seem to 
> be 64 sets of arrows, which is good because it corresponds to the 64 
> slices of MRI data I used.  But each of the sets of arrows, supposedly 
> from each of the slices, seem to originate from a single point on a 
> line.  I was expecting to see the field in a manner similar to that of 
> the 2D deformable registration examples, where arrows are located on the 
> images in plane, showing what features have moved and where they have 
> moved to.  Is it possible to get that in the 3D case?  Are there other 
> ways of visualizing 3D deformation fields in ParaView?
> 
> Note that my fixed, moving, and output images for the registration are 
> in the ANALYZE format (.hdr and .img files) and my deformation field is 
> in the Meta image file format (.mhd and .raw files).
> 
> 
> Thank You,
> Kevin
> 
> 
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