[ITK Community] Smoothness term in ITK

[Andras Lasso]

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<mailto: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<mailto: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<mailto: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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