[Insight-users] Segmentation/colliding filters/FAst marching

[Luis Ibanez]

Hi Gaurav,


1) You should run the FastMarching method using
     the seed point inside the aneurysm.

2) Yes, there will be an overlap between the too
     regions.

Please note that both of this methods have numerical
parameters that you will have to fine tune. There is
some experimentation required here.

3) Variations of intensity along the arteries may be
    a problem. Are you using and angiogram that was
    acquired with a contrast agent ?

    The path that you will get doesn't follow a straight line,
    it should follow the center line of the artery (once you
    fine tune the parameters).

4)  Please read the description of the FastMarching
      image filter in the ITK Software Guide

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




   Regards,


         Luis



---------------------------------------------------------------------------
On Mon, Feb 15, 2010 at 6:42 PM, Gaurav Sharda
<gaurav.sharda.uiowa at gmail.com> wrote:
> Hi!
>
> Hey one quick doubt. When we apply the colliding filter with one seed point
> in the aneurysm and one in the vessel then a line between the two will be
> traced.
> After that if we apply the quick marching segmentation to detect the
> inflated region of the aneurysm, then which seed points have to be selected?
> and would there be any overlapping between the two methods used?
>
> Also, in the colliding filter if we give one end point on one end of the
> artery and the other at  the other end of the artery then wont it go over
> through the inflated portion of the image as well because it is of the same
> intensity as the beginning point of the artery? Or will it sketch a straight
> line between the two seed points?
>
> Ans also if possible a quick short summary about the level marching
> segmentation method as it looked a little confusing in the application. If
> you could explain it in context with the cerebral aneurysm that would be
> thoroughly appreciated.
>
> THANKS A LOT!!!!
>
> Reallly thank you,
>
> Regards,
> Gaurav.
>
> _____________________________________
> 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
>
>