[ITK] [ITK-users] FEM based deformable registration

[Matt McCormick]

Hi Tony,

I am not aware of an example of constructing a FEMObject in this way.
We could work on creating one.  Is there an example dataset to work
on?

Thanks,
Matt

On Tue, Apr 15, 2014 at 2:01 PM, Tony <bowler0_uk at yahoo.com> wrote:
> Hi Matt,
>
> I think this is what I am looking for. I don't know a huge amount about FEM so I'm not sure I would trust myself to construct the FEM object based on what I have found so far. Is it possible to let the registration filter construct the object as in deformable registration example 11 for example and then I modify the material properties? Alternatively, is there fairly extensive documentation for using FEMObject somewhere beyond the code browser?
>
> Thanks,
>
> Tony
>
> ----- Original Message -----
> From: Matt McCormick <matt.mccormick at kitware.com>
> To: Tony <bowler0_uk at yahoo.com>
> Cc: "insight-users at itk.org" <insight-users at itk.org>
> Sent: Monday, 14 April 2014, 18:05
> Subject: Re: [ITK] [ITK-users] FEM based deformable registration
>
> Hi Tony,
>
> By default the FEM-based deformable registration assumes uniform
> material properties.  If different material properties are chosen a
> priori, a manually constructed FEMObject could in principle be set
> with SetInputFEMObject [1].  This is much simpler than the general
> inverse problem, where an attempt is made to also learn the material
> elasticity.  However, if there is some indication with intensity, for
> example, of local elasticity in the input images, it could be used to
> generate a more realistic result.
>
> Hope this helps,
> Matt
>
> [1] http://www.itk.org/Doxygen/html/classitk_1_1fem_1_1FEMRegistrationFilter.html#a4d27383fe91a76c385c3684f96a63934
>
> On Mon, Apr 14, 2014 at 12:00 PM, Tony <bowler0_uk at yahoo.com> wrote:
>> Dear list,
>>
>> I have been trying to learn and understand FEM based deformable registration. Is it possible to assign different material properties to different voxels both in principle and currently in ITK. If the answer to both of these is yes - is there an exmaple floating around?
>>
>> Thanks.
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