[Insight-users] Linear elasticity

[Luis Ibanez]

Hi Helder,


Are you doing this because


A) You are performing deformable image registration ?

                  or

B) You are building a mechanical simulation of cardiac tissue ?



If you are in case (A), note that ITK uses the FEM model
*just as a metaphor* for regularizing a deformation field.
There is *no real connection* between the parameters that
you put in the FEM model (for image registration) and the
physical reality of the tissue that is displayed in the image.
The physical model is just a way of controlling how flexible
the deformation field will be.


If you are in case (B), then yes, you can use ITK FEM classes
in order to run a real FEM simulation of a physical object.
However, instead of the model telling you what the elasticity
value is, it is *you* who must tell the model what this value
is.  The FEM model cannot compute that for you, unless to
configure an experiment in which you solve an inverse problem.
E.g. you apply a known force to the tissue and you measure the
physical deformation.



Please let us which one of the cases above is the one you
are dealing with, so we can give you better advice,



   Thanks


     Luis




------------------------
Helder Carvalho wrote:

> Hi users,
> 
> Can someone tell me if i can use the itkFEM classes to calculate the
> elasticity of a PolyData representing a human Left Ventricle. If I can, 
> could
> you please tell me the different options and the steps that i need to
> perform. Do classes like the itkFEMElement3DCOLinearHexahedronStrain 
> actually
> calculate the strain of that particular element?
> 
> Thanks in advance,
> Helder Carvalho
> 
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