<div>Could someone file a bug report?</div>
<div> </div>
<div>Thanks,</div>
<div> </div>
<div>Bill<br></div>
<div class="gmail_quote">On Dec 10, 2007 11:41 AM, Luca Antiga <<a href="mailto:luca.antiga@gmail.com">luca.antiga@gmail.com</a>> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Hi all,<br>
<div class="Ih2E3d"><br>>> However, as Karthik pointed out, it remains to be seen whether there<br>>> are other places where the spacing should have been taking into<br>>> account.<br>>> (and may have not been used correctly).
<br><br></div>from what I recall, spacing is important in the<br>itk::SparseFieldLevelSetImageFilter<br>class, which is a child of itk::FiniteDifferenceImageFilter and a<br>base class for most<br>of the actual level sets classes.
<br>itk::SparseFieldLevelSetImageFilter contains all the machinery needed<br>to track the<br>zero level front, which includes computing upwind gradients and<br>evaluating the<br>distance of the zero level set from the voxels in the various layers.
<br>That part I<br>believe is the hardest part that needs to be revisited if one wants<br>to allow<br>anisotropic spacings in level sets.<br><br>Other than this, also other bits, like<br>itk::SegmentationLevelSetFunction::AdvectionField,
<br>assume uniform spacing, but they are definitely easier to fix.<br><br>I'll be happy to give my contribution if you want to embark in this<br>adventure!<br>I think this would make it for a very useful generalization (I know,
<br>Luis, I know we should<br>ask our radiologists to acquire at isotropic resolutions... :-) )<br><br>Cheers<br><br>Luca<br><br>--<br><font color="#888888">Luca Antiga, PhD<br>Head, Medical Imaging Unit,<br>Bioengineering Department,
<br>Mario Negri Institute<br>email: <a href="mailto:antiga@marionegri.it">antiga@marionegri.it</a><br>web: <a href="http://villacamozzi.marionegri.it/~luca" target="_blank">http://villacamozzi.marionegri.it/~luca</a><br>mail: Villa Camozzi, 24020, Ranica (BG), Italy
<br>phone: +39 035 4535-381<br></font>
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<div></div>
<div class="Wj3C7c"><br><br>On Dec 10, 2007, at 5:22 PM, Charl Botha wrote:<br><br>> On 12/10/07, Luis Ibanez <<a href="mailto:luis.ibanez@kitware.com">luis.ibanez@kitware.com</a>> wrote:<br>>> However, as Karthik pointed out, it remains to be seen whether there
<br>>> are other places where the spacing should have been taking into<br>>> account.<br>>> (and may have not been used correctly).<br>><br>> Karthik and Luis, thanks for your rapid and informative answers!
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