[Insight-users] Fast Marching Segmentation

[Luis Ibanez]

Hi Nisha,


If you are interested in segmenting vascular structures
you may want to try the itk::CollidingFrontsImageFilter
http://www.itk.org/Insight/Doxygen/html/classitk_1_1CollidingFrontsImageFilter.html

that was contributed by Luca Antiga.

---

Otherwise, in the FastMarching filter itself, the two best
actions to take in order to improve your segmentation are:


    1) Improve the speed input image to have stronger edges
       between veins and arteries


    2) Find a better threshold of the time crossing map
       that is the output of the FastMarching filter.
       You may find that a lower threshold value of the
       time crossing map the vein and arteries "may" be
       separated.


You may also find useful to pre-process the image with
any of the anisotropic diffusion filters in ITK.

You will find descriptions of these filter in the
ITK Software Guide


   http://www.itk.org/ItkSoftwareGuide.pdf



    Regards,


       Luis


------------------------------------------
Mukherjee, Nisha (NIH/CC/DRD) [F] wrote:
> Hello,
>    I am using the Geodesic Active Contours Segmentation Level Set to segment the pulmonary veins. However, the fast marching filter seems to be too inclusive, always segmenting the pulmonary arteries along with the veins. How might I fine-tune the parameters of the fast marching segmentation level set to produce a more precise segmentation? Thank you.
>  
> -- Nisha
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