[Insight-users] confirmation of isotropic spacing requirement for levelset filters in ITK

[Bill Lorensen]

Could someone file a bug report?

Thanks,

Bill
On Dec 10, 2007 11:41 AM, Luca Antiga <luca.antiga at gmail.com> wrote:

> Hi all,
>
> >> However, as Karthik pointed out, it remains to be seen whether there
> >> are other places where the spacing should have been taking into
> >> account.
> >> (and may have not been used correctly).
>
> from what I recall, spacing is important in the
> itk::SparseFieldLevelSetImageFilter
> class, which is a child of itk::FiniteDifferenceImageFilter and a
> base class for most
> of the actual level sets classes.
> itk::SparseFieldLevelSetImageFilter contains all the machinery needed
> to track the
> zero level front, which includes computing upwind gradients and
> evaluating the
> distance of the zero level set from the voxels in the various layers.
> That part I
> believe is the hardest part that needs to be revisited if one wants
> to allow
> anisotropic spacings in level sets.
>
> Other than this, also other bits, like
> itk::SegmentationLevelSetFunction::AdvectionField,
> assume uniform spacing, but they are definitely easier to fix.
>
> I'll be happy to give my contribution if you want to embark in this
> adventure!
> I think this would make it for a very useful generalization (I know,
> Luis, I know we should
> ask our radiologists to acquire at isotropic resolutions... :-) )
>
> Cheers
>
> Luca
>
> --
> Luca Antiga, PhD
> Head, Medical Imaging Unit,
> Bioengineering Department,
> Mario Negri Institute
> email: antiga at marionegri.it
> web: http://villacamozzi.marionegri.it/~luca
> mail: Villa Camozzi, 24020, Ranica (BG), Italy
> phone: +39 035 4535-381
>
>
> On Dec 10, 2007, at 5:22 PM, Charl Botha wrote:
>
> > On 12/10/07, Luis Ibanez <luis.ibanez at kitware.com> wrote:
> >> However, as Karthik pointed out, it remains to be seen whether there
> >> are other places where the spacing should have been taking into
> >> account.
> >> (and may have not been used correctly).
> >
> > Karthik and Luis, thanks for your rapid and informative answers!
> > _______________________________________________
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> > Insight-users at itk.org
> > http://www.itk.org/mailman/listinfo/insight-users
>
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