[Insight-users] Subtract background air CT

[Neil Panjwani]

Is it always guaranteed that the largest air component will be the
background air? What if you had a very large patient that covered most of
the CT window?

On Thu, Apr 7, 2011 at 12:52 PM, Sergio Vera <sergio.vera at alma3d.com> wrote:

> 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
>>
>> --
>> View this message in context:
>> http://itk-insight-users.2283740.n2.nabble.com/Subtract-background-air-CT-tp6250670p6250670.html
>> Sent from the ITK Insight Users mailing list archive at Nabble.com.
>> _____________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Kitware offers ITK Training Courses, for more information visit:
>> http://www.kitware.com/products/protraining.html
>>
>> Please keep messages on-topic and check the ITK FAQ at:
>> http://www.itk.org/Wiki/ITK_FAQ
>>
>> Follow this link to subscribe/unsubscribe:
>> http://www.itk.org/mailman/listinfo/insight-users
>>
>
>
>
> --
> Sergio Vera
>
>  Alma IT Systems
>  C/ Vilana, 4B, 4º 1ª
>  08022 Barcelona
>  T. (+34) 932 380 592
>  www.alma3d.com
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.itk.org/pipermail/insight-users/attachments/20110407/84f7e645/attachment.htm>