[Insight-users] Setting up FEM - Registration parameters

[Nicholas Tustison]

Hi Vadim,

If I understand you correctly, you would like to correlate the  
deformations you obtain from the FEM registration with the material  
properties of your registered objects.  The forces that the FEM  
method is using to perform the registration derive from the  
derivatives of the available image metrics.  These measurements have  
no relationship to the material properties of your registered  
objects.  Therefore, trying to make biomechanical inferences from the  
chosen Lame constants would be incorrect.  I believe Luis has  
explained this in previous postings.

The Crank-Nicolson solver is used for the FEM image registration  
filter which does utilize the rho and time step parameters.  However,  
there are other solvers available for general FEM use.

Good luck,
Nick




On Oct 30, 2006, at 10:01 PM, Vadim Stakhursky wrote:

> Hello, Nick,
> Can you please point to the units of the parameters in the FEM  
> routine? Pho, E, etc. g/cm^3? N/m^2? I am trying to apply the  
> method to some biomed deformations, but without exact knowledge  
> it's hard to interpret the result.
>   Thanks a lot,
>        Vadim
> P.S. Also, my understanding is the basic solver is static. Does it  
> mean Rho and time step is not considered? Thanks!
>

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