[Insight-users] Linear Elasticity

[Helder Carvalho]

Hi Luis,


Thanks for the answer, I'm trying to do something similar to the B case you
presented.  Building a mechanical simulation of the left ventricle in order
to calculate the stress, strain and consequently the elasticity of the left
ventricle during a cardiac cycle. Could you please give some clues on the
steps i need to do and the classes ITK has to achieve this.

Thanks,
Helder

>From: Luis Ibanez <luis.ibanez at kitware.com>
>To: Helder Carvalho <hel_carvalho at hotmail.com>
>CC: insight-users at itk.org
>Subject: Re: [Insight-users] Linear elasticity
>Date: Mon, 22 Nov 2004 18:23:06 -0500
>
>
>
>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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>
>
>
>

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