[Insight-users] How to smooth the segmented surface

[Xiaopeng Yang]

This example doesnot work. Still the stairs appear at the surface of the reconstured 3D liver due to the large CT slice interval (5 mm).

Thanks,
Xiaopeng

-----Original Message-----
From: insight-users-bounces at itk.org [mailto:insight-users-bounces at itk.org] On Behalf Of Bill Lorensen
Sent: Thursday, March 22, 2012 3:06 AM
To: Bradley Lowekamp
Cc: insight-users at itk.org
Subject: Re: [Insight-users] How to smooth the segmented surface

Look at this example:
http://itk.org/Wiki/ITK/Examples/Smoothing/AntiAliasBinaryImageFilter


On Wed, Mar 21, 2012 at 6:11 AM, Bradley Lowekamp
<blowekamp at mail.nih.gov> wrote:
> If the results of your segmentation was just labeled pixels, you may
> consider a level-set representation to obtain a sub-pixel representation of
> the surface. This could be a completed simply by smoothing the mask with a
> filter such as CurvatureFlowImageFilter, or refining the segmentation with a
> filter such as LaplacianSegmentationLevelSetImageFilter.
>
>
> On Mar 21, 2012, at 6:07 AM, Dženan Zukić wrote:
>
> You can resample the image, or use linear interpolator.
>
> 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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> ========================================================
>
> Bradley Lowekamp
>
> Medical Science and Computing for
>
> Office of High Performance Computing and Communications
>
> National Library of Medicine
>
> blowekamp at mail.nih.gov
>
>
>
>
>
> _____________________________________
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> Visit other Kitware open-source projects at
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