[Insight-users] CT Lung Segmentation: Extract Outer Contours

[Luis Ibanez]

Hi Frederic,

1) In order to fill-up holes you may want to use
    the filter:

   itkVotingBinaryIterativeHoleFillingImageFilter

    or the faster (but experimental) version in the
    NAMIC Sandbox:


itkVotingBinaryHoleFillFloodingImageFilter.h

http://svn.na-mic.org/NAMICSandBox/trunk/VotingHoleFillFloodingImageFilter/Source/



2)  Were you considering surface extraction
     as an alternative method for filling-up the
     holes ?

      or do you need to do surface extraction
      anyways ?




    Regards,


            Luis


---------------------------------------------
2010/1/19 frédéric salvador <frederic.salvador at gmail.com>:
> Dear all,
>
>
> So as to segment lungs in CT volume, I implemented the following steps:
>    - low-pass smoothing,
>    - binary thresolding,
>    - connected component analysis,
>    - (eventually some objects relabelling).
>
> So now I get a good binary mask of the lung volume.
>
> Though, there are numerous veins and arteries in the lungs volume (appearing
> in black in my binary mask) that I would like to fill.
>
> I tried a rolling-ball operator consisting of a morphological closing
> followed by a hole filling filter. But as my image is 512*512*605 it takes
> too long computation time for my application. Besides, the kernel should be
> pretty big so as to fill big holes.
>
> So here comes my question:
> Is it possible:
>    - to extract the outer surface, by using marching cubes for instance, and
> fill inside the surface?
> OR
>    - to extract and operate on 2D slice to extract the outer contours, by
> using some itk or vtk contour filter, and of course fill inside the outer
> contours?
>
>
> I have been struggling a few hours on this, so your help would be highly
> appreciated.
>
> Thanks a lot in advance for your answer.
>
> Fred
>
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