[Insight-users] Re: [vtkusers] A theoretical question

[Daniel Mace]

Arne,

Is your question: what methods are out there that you can use (but would 
need to implement), or what methods are in ITK/VTK that you could use?  
The standard shape model in ITK is the the work done by Leventon et al. 
( 
http://spl.bwh.harvard.edu:8000/pages/papers/leventon/cvpr00/cvpr00.pdf 
).  His method basically relies on the observation that the gradient of 
an image is inversely related to a signed distance map and created a MAP 
estimate from it.  If you already have your mean + modes of variation 
then using his method should be easy to implement (easy to implement, 
getting the parameters to converge might take a bit).  It's described in 
9.3.7 in the ITK software guide.

Cheers,
Dan

Arne Hansen wrote:
> Hello. I have a question regarding the use of shape models built using 
> Signed Distance Maps(Level Set Function).
> I have applied a principal component analysis on my Level Set 
> Functions, and found a meanshape + modes of variation.
> I now need to use these as prior information in a segmentation model 
> where certain regions(those which my shape model represent) needs to 
> be segmeneted.
> I am however unsure of how i can do this. So my question is if an 
> Active Appearance Model technique can be used when i have built my 
> shape model on Level Set Functions, or if i actually need to do it on 
> landmarks.
>  
> Is there other methods to use?
> Maybe you can recommend a method to use.
> Thank you very much, and best of regards.
> Arne Hansen
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