[Insight-users] multi-modality with FEM or with Demons ?

[Hari Sundar]

Hi Luis,

I am trying to use the bSpline Transform based deformable registration
in 3D. It seems to take a long time and is not getting anywhere.
Basically what happens is that it prints out the initial parameters
(all zeros) and then says "Starting Registration" .. however it does
not proceed ... I mean shouldn't the observer at least report the
iteration number ?

Any estimates on how long it is supposed to take when working in 3D ..
say trying to register 2 256^3 images.

thanks,
-Hari

> 
> Hi Eduard,
> 
> An example on how to perform deformable registration
> using the BSpline transform has been added under
> 
>    Insight/Examples/Registration/
>                DeformableRegistration4.cxx
> 
> You may have to update your CVS checkout in order to
> get this example.
> 
> Regards,
> 
>     Luis
> 
> ---------------------------
> Eduard Schreibmann wrote:
> 
> > Hi Luis,
> >
> > As you suggested in your previous e-mail, the Demons did not work so nice
> > for the images I have, FEM needs more cofee and patience, so thinking of
> > following your second advice on using BSpline.
> >
> > Have problems understanding the code and how it works, mainly I can not
> > understand how  BSplineDeformableTransform (or it's coeficients ?) are
> > connected to an optimizer. Yes, users still ask such dull questions.
> >
> > Is there any simple BSline example/demo available somewhere ? Some code in
> > testing section is even more confusing for beginers.
> >
> > Thank you in advance,
> > Edi
> >
> >
> >
> >>Hi Edi,
> >>Along those lines of reasoning, you may want to look
> >>at the BSpline transform for managing deformable
> >>registration. In this method, a BSpline is used to
> >>interpolate deformations over a coarse grid overlapped
> >>on top of the image. you control the deformation by
> >>initializing the nodes of the grid.
> >>
> >>
> >>
> >>
> >>Regards,
> >>
> >>
> >>
> >>    Luis
> >>
> >>
> >>
> >>---------------------------
> >>Schreibmann Eduard wrote:
> >>
> >>
> >>>Hello everybody,
> >>>
> >>>Question 1 :
> >>>I want to use FEM to register some CT and MRI images,
> >>>using the  DeformableRegistration1.exe. With the
> >>>demo images, it works great but...
> >>>
> >>>When using some CT and MRI images that came with ITK (
> >>>BrainT1Slice and BrainProtonDensitySlice.png ), and
> >>>with setting the metric to 3 (MI) in the configuration
> >>>file, the application finishes after 2-3 iterations
> >>>without doing something visible to the input image.
> >>>Basically, the only thing changed in the parameter
> >>>file was file names and metric type.
> >>>
> >>>What parameters control this behavior ?
> >>>What settings are appropriate for this job ?
> >>>
> >>>Question 2: Is it true that demons can not be used for
> >>>multi-modality registration ?
> >>>
> >>>Question 3: The "viscous fluid landmark" registration
> >>>has anything to do with demons or FEM ?
> >>>
> >>>Thank you in advance,
> >>>
> >>>A nice day,
> >>>Edi
> >>>
> >
> >
> >
> >
> >
> 
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