[Insight-users] How to smooth the segmented surface

[Dženan Zukić]

For the resampling you have to make sure to use either linear, cubic, or
some more advanced interpolation scheme, not the nearest neighbor which is
the default I think.

2012/3/22 Xiaopeng Yang <yxp233 at postech.ac.kr>

> I resampled the segmented mask images. But when I apply vtkcontourfilter
> to generate a 3D surface, only iso-surfaces of the original slices of the
> mask images are generated, not including the resampled slices. Thus the
> results look the same as before. Still stairs appear.****
>
> ** **
>
> Thanks,****
>
> Xiaopeng ****
>
> *From:* Dženan Zukić [mailto:dzenanz at gmail.com]
> *Sent:* Wednesday, March 21, 2012 7:07 PM
> *To:* Xiaopeng Yang
> *Cc:* Kent Ogden; insight-users at itk.org
>
> *Subject:* Re: [Insight-users] How to smooth the segmented surface****
>
> ** **
>
> You can resample<http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/ResampleImageFilter>the image, or use linear
> interpolator<http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/LinearInterpolateImageFunction>
> .****
>
> On Tue, Mar 20, 2012 at 14:07, Xiaopeng Yang <yxp233 at postech.ac.kr> wrote:
> ****
>
> Hi Kent,****
>
>  ****
>
> Do you know any interpolate class in ITK which can generate more slices?
> For volumetry, I guess I can use the original data.****
>
>  ****
>
> Thanks,****
>
> Xiaopeng****
>
>  ****
>
> *From:* Kent Ogden [mailto:ogdenk at upstate.edu]
> *Sent:* Tuesday, March 20, 2012 9:50 PM
> *To:* insight-users at itk.org; Xiaopeng Yang****
>
>
> *Subject:* Re: [Insight-users] How to smooth the segmented surface****
>
>  ****
>
> Xiaopeng, ****
>
>  ****
>
> This is a fundamental limitation of your data that can only truly be
> solved by reconstructing thinner slices at the time of the scan.  You could
> interpolate between images to generate more slices, which would result in a
> smoother looking rendering.  If you are trying to make quantitative
> measurements (e.g. volume) you must be careful about these kinds of
> manipulations though. ****
>
>  ****
>
> Kent ****
>
>  ****
>
>
>
> >>> "Xiaopeng Yang" <yxp233 at postech.ac.kr> 3/19/2012 10:17 PM >>>****
>
> Dear Users, ****
>
>   ****
>
> I have tried to segment the liver from 5 mm CT slices. When I tried to
> visualize the segmented liver in 3D, I found that the surface of the 3D
> liver was discrete, just like stairs. I guess that is because of the 5 mm
> interval between CT slices. Do you guys have any good idea how to make the
> 3D surface of the liver look continuous and smooth? ****
>
>   ****
>
> Thanks, ****
>
> Xiaopeng ****
>
>
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