[Insight-users] 3D segmentation of LUNGS ( Region growing algorithm ) Need help

[Luis Ibanez]

Hi Wassim,

Please do the following:

0) Extract a region of interest that includes the Trackea,
    and the full Lungs, but not the head of the patient
    (e.g. cut below the head, somewhere in the neck).
    You can use the RegionOfInterestImageFilter for this.
http://www.itk.org/Insight/Doxygen/html/classitk_1_1RegionOfInterestImageFilter.html


1) Use the ConnectedThresholdImageFilter
http://www.itk.org/Insight/Doxygen/html/classitk_1_1ConnectedThresholdImageFilter.html

2) Set seed points inside the Trackea
    (one seed point should be enough

3) Set the lower threshold to -700 Hounsfield Units

4) Set the upper threshodl to -200 Hounsfield Units

5) Run the filter


This shoudld give you a binary mask of the two lungs.

If you find many holes inside the mask, you could
clean it up with the Morphological filters or the
Voting Hole filling filters.


         Start typing....   :-)


Once you are done, please keep in mind that we are
happy to get "case studies" as papers to the Insight
Journal. http://www.insight-journal.org/

These, more than "papers", are actually "technical
reports". Yours could be entitled "Using ITK for
Lung segmentation".

Please let us know if you need any help on writing
this report.



     Regards,


        Luis



------------
wassim_belhadj at topnet.tn wrote:
> Hi, 
> 
> I'am using VTK and Qt4 for volume rendering.
> 
> I'm trying to define values of pixel that define LUNGS.
> 
> I assigned opacity to each pixel by checking its intensity value  with
> Hounsfield Units values.
> 
> I  obtained a volume that contains the lungs and skin/air. 
> 
> 
> I varied the opacity values to eliminate the skin that surrounds the lungs
> but I have not succeeded.
> 
> VTK users asked me to do a segmentation (region growing algorithm ) to
> display ONLY the lungs. 
> 
> http://www.vtk.org/pipermail/vtkusers/2009-February/099524.html
> 
> Can you help me? 
> 
> How do I proceed (ITK-VTK)?
> 
> Have you an example of 3D segmentation (region growing algorithm)?
> 
> Regards, Wassim
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