[Insight-users] Behavior of FastMarchingImageFilter

[Amardeep Singh]

Hello everyone

I am wondering about the behavior of the FastMarchingImageFilter.
I want to let the algorithm march from a certain surface which is
represented by a binary image. I
pass the points of the object as alive points to the marcher. The layer
outside of the object (in my case: a brain)
is passed as trial points. When I look at the output of the fast
marching filter, there is something strange -> see attached screenshot.

The area within the yellow line is my initial object. So they are all
alive points whose value is 0 in the output.  But when you look at the layer
outside of the inner object, you see that it is jagged, black (value 0)
and white (value != 0) voxels take turns. Why is this the case?
What do I need to do, so that the marcher marches equally away from the
alive points. The speed image values on the layer around the alive
points do have the same value, so this is not the reason.

Thanks a lot in advance!

Best Regards
Amar


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