[Insight-users] Vessel seg Hessian3DToVesselnessMeasureImageFilter Question

[Luis Ibanez]

Hi Gen,


   1. As Cagatay pointed out, the Vesselness filter produces a scalar image
   containing a "Vesselness" measure, which indicate how much every
   pixel "looks like" being part of a Vessel. The filter is not intended to
   produce a binary image.
   You could use the output of this filter as the input of a Thresholding
   filter or the input of a region growing filter
   2. The Sigma relates to the diameter of the Vessel that you are
   looking for. Larger sigmas will tune the filter for detecting larger
   vessels.
   Please note that the units of Sigma in this filter are in physical units
   (e.g. millimeters).
   3. For good values of Alpha1 and Alpha2, please look at the
   LesionSizingToolkit
   http://public.kitware.com/LesionSizingKit/index.php/Main_Page
   It is based on ITK.
   If you look at the subdirectory:
   LesionSizingKit/Sandbox/Source/

   You will find the file:
   itkSatoVesselnessFeatureGenerator.h

   The values we use there are:

   Alpha1 = 0.1
   Alpha2 = 2.0



  Regards,


       Luis


---------------------------------------
On Sat, Feb 21, 2009 at 7:40 PM, Gen-Nan Chen <gnchen at gmail.com> wrote:

>  Hi! All,
>
> I tried to use Hessian3DToVesselnessMeasureImageFilter to segment vessel
> tree in the lung. I have a few questions here
>
> 1. The output Image of Hessian3DToVesselnessMeasureImageFilter is not a
> binary image as I thought. Can anyone tell me what those voxel value mean?
> Do I need to
> \
> 2. HessianRecursiveGaussianImageFilter's sigma. Anyone know what does this
> sigma value mean and for? Looks like I can get a biggger vessel by using a
> bigger sigma?
>
> 3. For thin tube like those vessels in the lung, what's the recommendation
> value for alph1 and alph2?
>
> --
> Gen-Nan Chen,
> email: gnchen at gmail.com
>
> _____________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.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
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.itk.org/pipermail/insight-users/attachments/20090224/2b6a4f3c/attachment.htm>