[Insight-users] Loads in background intentionally nulled

[Magnotta, Vincent A]

The new fem framework will provide the same functionality as the previous
version, but with a much more ITK like interface. We have also removed the
I/O and configuration file that was used in the previous version of the
FEMRegistrationFilter. The user will now be able to provide their own mesh
if desired for the registration. If no mesh if provided, then the mesh is
generated directly from the image as in the previous version of the
filter. This should provide much more flexibility in the registration.

Vince


On 6/2/11 12:33 PM, "brian avants" <stnava at gmail.com> wrote:

>yes, that is what the LoadBC option does, i believe.
>
>brian
>
>
>
>
>On Thu, Jun 2, 2011 at 11:23 AM, James Gee <gee at exchange.upenn.edu> wrote:
>> more traditionally, one would typically update stiffness matrix and load
>> vectors directly.  ideally, new framework will maintain transparency to
>> allow this option.
>>
>> On 5/26/11 1:59 PM, "brian avants" <stnava at gmail.com> wrote:
>>
>>>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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>>
>_____________________________________
>Powered by www.kitware.com
>
>Visit other Kitware open-source projects at
>http://www.kitware.com/opensource/opensource.html
>
>Kitware offers ITK Training Courses, for more information visit:
>http://www.kitware.com/products/protraining.html
>
>Please keep messages on-topic and check the ITK FAQ at:
>http://www.itk.org/Wiki/ITK_FAQ
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