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

[Tony]

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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