[ITK Community] Smoothness term in ITK

[Hana Cherif]

Thank you so much Matt,, Luis ,,  David,,  thank you all,,


2014/1/20 Matt McCormick <matt.mccormick at kitware.com>

> Hi,
>
> There is a class implemented that does Gaussian smoothing on a
> displacement field transform during a registration iteration update:
>
>
> http://itk.org/Doxygen/html/classitk_1_1GaussianSmoothingOnUpdateDisplacementFieldTransform.html#a486d7a5466744497b3793b8161472fdc
>
> Hope this helps,
> Matt
>
> On Sun, Jan 19, 2014 at 10:43 PM, David R. Haynor
> <haynor at u.washington.edu> wrote:
> > hi all,
> >
> > a smoothing term is easily incorporated into registration, along with its
> > gradients.  i don't understand luis's comment.
> >
> > -dh
> >
> >
> > On Mon, 20 Jan 2014, Andras Lasso wrote:
> >
> >>
> >> It would be great to have a term in the registration metric to penalize
> >> non-smoothness of the BSpline (displacement of the control points).
> >> Currently, the
> >> BSpline registration in ITK cannot be used on many radiation therapy CT
> >> scans, because the BSpline control points wander randomly in the
> soft-tissue
> >> regions
> >> that look quite homogeneous in CT. For example, the BSpline registration
> >> implementation in Plastimatch can penalize the control point
> displacement
> >> and the
> >> result is a nice smooth displacement field.
> >>
> >>
> >>
> >> Andras
> >>
> >>
> >>
> >> From: Community [mailto:community-bounces at itk.org] On Behalf Of Luis
> >> Ibanez
> >> Sent: January 19, 2014 3:44 PM
> >> To: Hana Cherif
> >> Cc: community at itk.org
> >> Subject: Re: [ITK Community] Smoothness term in ITK
> >>
> >>
> >>
> >> Hana,
> >>
> >>
> >>
> >> A smoothing term, will probably only make sense for the Deformable
> >> transforms:
> >>
> >>
> >>
> >> * Kernel Transform
> >>
> >> * Displacement Field
> >>
> >> * BSpline Deformations
> >>
> >>
> >>
> >> Note that, this would be rather a measure that is computed after the
> fact,
> >>
> >> rather than something that is computed during the registration process.
> >>
> >>
> >>
> >> Although in the case of the Demons registration, there is indeed the
> >> equivalent
> >>
> >> of a smoothness constraint.
> >>
> >>
> >>
> >>    Regards,
> >>
> >>
> >>
> >>
> >>
> >>        Luis
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> On Sun, Jan 19, 2014 at 3:27 PM, Hana Cherif <hanacherif62 at gmail.com>
> >> wrote:
> >>
> >> Hi Mr.  Louis
> >>
> >> I  refer to transform classes in itk ,, thanks
> >>
> >>
> >>
> >> 2014/1/19 Luis Ibanez <luis.ibanez at kitware.com>
> >>
> >> Hi Hana,
> >>
> >>
> >>
> >> Are you referring to the itk::Transform classes ?
> >>
> >>
> >>
> >> or to Level Set filters ?
> >>
> >>
> >>
> >> Could you please elaborate a bit more ?
> >>
> >>
> >>
> >>     Thanks
> >>
> >>
> >>
> >>          Luis
> >>
> >>
> >>
> >>
> >>
> >> On Sun, Jan 19, 2014 at 3:21 PM, Hana Cherif <hanacherif62 at gmail.com>
> >> wrote:
> >>
> >>       Hello,, all!!
> >>
> >> A question please ::  In addition to the similarity term,,  is there a
> >> componnent  in itk used to compute the smothness term of that
> transformation
> >> ??
> >>
> >> Thanks for help in advance!!
> >>
> >>
> >>
> >> _______________________________________________
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> >> Community at itk.org
> >> http://public.kitware.com/cgi-bin/mailman/listinfo/community
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
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> >
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