[Insight-users] help in choosing right deformable registration algorithms

[Vivien Delmon]

On 10/16/2011 07:36 PM, Ryan Guan wrote:
> Dear ITK Users,

Hi Ryan,

> I am new to DIR world and I need to work out the best DVFs for my
> 'deformed' phantom images.
> I tried Demons and B-Spline as in DeformableRegistration2 and
> DeformableRegistration7, but neither of them seem to be very good. The
> results can be downloaded from my dropbox:
> Demons:
> http://dl.dropbox.com/u/1906263/golf_demons.gif
> B-Spline:
> http://dl.dropbox.com/u/1906263/golf_bspline.gif
>
> The B-Spline ones look more reasonable but still with quite obvious
> errors at the region where there is no deformation. I guess there might
> be something to do before deformable registration could be helpful or
> there might be better algorithms for this case? Your suggestions will be
> appreciated VERY MUCH!

In your image you have a background which is not moving. It is in 
contradiction with the image registration that tries to find a smooth 
vector field on the whole image. In your case your transformation is 
locally a translation so you should try to find a translation on a 
masked image that isolate your object from your background.

> Another question regarding visualizing vector fields in Paraview: it
> seems that Paraview display PNG (images) and VTK (vector field, after
> 'scalars_X*iHat+scalars_Y*jHat' and glyph) in different Y orientations.
> I haven't figured out how to correctly overlay them, but just tried to
> flip and shift the vector field in Paraview, so the vector field in the
> above results might not be quite aligned with the images. Will also
> appreciate if you can help to let me know the best&correct way to
> visualize the vector fields!

I don't know how Paraview work but for vertor field visualisation I use 
VV (http://www.creatis.insa-lyon.fr/rio/vv)

> Thanks a lot for any inputs!
>
> Ryan

-- 
Vivien Delmon
PhD student at CREATIS, Lyon
Supported by ANRT and ELEKTA
http://www.creatis.insa-lyon.fr/rio