[Insight-users] Subtract background air CT

[Sergio Vera]

Hi
I don't know the internals of thje BinaryKeeepNObjectsImageFilter byt maybe
it's simpler (and faster) to just remove the biggest label, and not the one
with more voxels on the border. Doing it on the whole 3D image instead of
slice by slice seems to be faster and simpler. Have yoy tried already
something similar?

On Thu, Apr 7, 2011 at 6:28 PM, paniwani <paniwani at gmail.com> wrote:

> What is the best way to remove the background air after thresholding < -600
> on a CT dataset? I currently use the BinaryShapeKeepNObjectsImageFilter to
> detect the largest component with "SizeOnBorder" and then remove this
> background from my image. However, this step is one of the slowest in my
> algorithm when performed over ~400 slices. Is there a faster and/or easier
> way?
>
> http://itk-insight-users.2283740.n2.nabble.com/file/n6250670/img1.jpg
> http://itk-insight-users.2283740.n2.nabble.com/file/n6250670/img2.jpg
> http://itk-insight-users.2283740.n2.nabble.com/file/n6250670/img3.jpg
>
> Thanks,
> Neil
>
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-- 
Sergio Vera

 Alma IT Systems
 C/ Vilana, 4B, 4º 1ª
 08022 Barcelona
 T. (+34) 932 380 592
 www.alma3d.com
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