[Insight-users] Loads in background intentionally nulled

[brian avants]

hi luis

 you can achieve this in numerous ways via the fem framework.  one
approach would be to apply a mask to the image metric which should
zero out forces outside the mask ....  though the model will
distribute some forces outside of the object.   if you want to totally
eliminate background displacements, then you should not mesh it at
all.   if you must mesh the background as well, then another approach
would be to apply either landmark forces ( mapping a point to itself )
and / or  fixed boundary conditions (loadbc).  another option would be
to change the material properties of background elements such that
they become very stiff.

vince may have more recent code examples that illustrate these possibilities,

brian




On Thu, May 26, 2011 at 1:38 PM, Luis Ibanez <luis.ibanez at kitware.com> wrote:
> Hi Brian, Michael,
>
> Could you advice Jonathan on how to do this in the FEM framework ?\
>
>
>    Thanks
>
>
>         Luis
>
>
> ---------- Forwarded message ----------
> From: jonathan grimm <flymolo at gmail.com>
> Date: Mon, May 23, 2011 at 5:08 PM
> Subject: Re: [Insight-users] Loads in background intentionally nulled
> To: insight-users at itk.org
>
>
>
> In http://www.itk.org/CourseWare/Training/NonRigidRegistrationMethods.pdf,
> page 80 a case is mentioned where the loads in the background are
> intentionally nulled.
>
> Is example code available for this case or a similar one?
>
> Does it require a mesh where the background is identified?
>
> Are there other methods to reduce spurious displacements in low
> information areas?
>
> Thank you for any help,
> Jonathan
>
> --
> Sometimes it's hard to tell the dancer from the dance - Corwin in CoC
>
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