[Insight-users] No important changes in DeformableMesh3DFilter

[Samuel Rodríguez Bescos]

Thanks!!!

I'll try with parameters like you use and  I report what happens.

I think that other factor is that the boundaries isn't enough close to the
boundaries of the image. Do you know it could be right?.

Danke Shön!!

Sam
----- Original Message -----
From: "Th. Boettger" <t.boettger@dkfz-heidelberg.de>
To: "Samuel Rodríguez Bescos" <srodrigu@gbt.tfo.upm.es>
Sent: Monday, January 20, 2003 4:33 PM
Subject: Re: [Insight-users] No important changes in DeformableMesh3DFilter


> I used values from 5 to 2. Higher values at the beginning of the
> deformation and smaller sigmas at the end. In this way the model is more
> attracted by gradients far away at the beginning and at the end drawn
> nearer to the gradient. 3 Seems to be good. Depending on your gradient
> image it can always happen that nothing changes. But by increasing the
> time step something should happen at a point, even if it doesn't make
> sense and isn't exactly what you wanted.
>
> Bye Thomas
>
> Samuel Rodríguez Bescos wrote:
> > Sorry for the previous message. I didn't write anything!!!!!!!!!
> >
> >
> > Hi Thomas
> >
> > The Sigma Value I'm using is 3.0. Do you think that This parameters must
be
> > lower?.
> >
> > Thanks for your help.
> >
> > Sam
> > ----- Original Message -----
> > From: "Th. Boettger" <t.boettger@dkfz-heidelberg.de>
> > To: "Samuel Rodríguez Bescos" <srodrigu@gbt.tfo.upm.es>
> > Sent: Monday, January 20, 2003 3:54 PM
> > Subject: Re: [Insight-users] No important changes in
DeformableMesh3DFilter
> >
> >
> >
> >>The parameters seem to be a bit low to me. I tried the filter on liver
> >>data. My number of steps (step threshold) is at least 100 and the time
> >>step was between 2 and 10. Which sigma do you use for the gradient
> >>filtering? The mesh cannot be deformed very much when it isn't near any
> >>significant gradient. By the way I experienced that the output is
> >>invariant to changes in the stiffness parameters...
> >>
> >>Thomas
> >>
> >>Samuel Rodríguez Bescos wrote:
> >>
> >>>Hello everyone.
> >>>
> >>>Firstly I would like to congratulate to Luis,Will, Lydia Josh and the
> >>>Insight Consortium in general  for  make the
> >>>ITKGuide. It is a very usefull document and It makes everything easier.
> >>>
> >>>Now, I have a question about the DeformableMesh3DFilter.
> >>>
> >>>I'm using this filter with a initial mesh derived from the Marching
> >>
> > cubes
> >
> >>>implemented in ITK (BinaryMask3DMeshSource class) of  the binary image
> >>>resulted from a initial segmentation of the liver using the confidence
> >>>connected image filter. The gradient image is  the image before
applying
> >>
> > the
> >
> >>> itkGradientRecursiveGaussianImageFilter to the initial image.
> >>>
> >>>The parameters of the Deformable model filter are:
> >>>
> >>>Stiffness= [0.00001, 0.04];
> >>>Step Threshold=1
> >>>Time Step=0.10
> >>>
> >>>The Final is very similar to the initial mesh.
> >>>Do anybody know what could happen?.
> >>>Could the others demormable models filters like ballon force have
better
> >>>behaviour?.
> >>>
> >>>Thanks in advance.
> >>>
> >>>Sam
> >>>
> >>>
> >>>_______________________________________________
> >>>Insight-users mailing list
> >>>Insight-users@public.kitware.com
> >>>http://public.kitware.com/mailman/listinfo/insight-users
> >>
> >>
> >>
> >>--
> >>Dipl.-Inform. Thomas Boettger
> >>Deutsches Krebsforschungszentrum         (German Cancer Research Center)
> >>Div. Medical and Biological Informatics H0100    Tel: (+49) 6221-42 2328
> >>Im Neuenheimer Feld 280                          Fax: (+49) 6221-42 2345
> >>D-69120 Heidelberg                            e-mail: t.boettger@dkfz.de
> >>Germany                      http://www.dkfz.de/mbi/people/thomasb.shtml
> >>
> >
> >
>
>
>
> --
> Dipl.-Inform. Thomas Boettger
> Deutsches Krebsforschungszentrum         (German Cancer Research Center)
> Div. Medical and Biological Informatics H0100    Tel: (+49) 6221-42 2328
> Im Neuenheimer Feld 280                          Fax: (+49) 6221-42 2345
> D-69120 Heidelberg                            e-mail: t.boettger@dkfz.de
> Germany                      http://www.dkfz.de/mbi/people/thomasb.shtml
>