[Insight-users] Threshold Level Set Segmentation Example

[Kashigar, Aidin (GE Healthcare)]

Hello all,
 
I have a question about the example provided for
ThresholdSegmentationLevelSetImageFilter. The exmaple uses the result of
a Fast Marching filter for the seed image of the Threshold Level Set
segmentaiton filter. The Fast Marching filter has a speed constant of 1
and is therefore just an approximate distance function from the seed
points. 
 
What I don't understand is the reason behind using Fast Marching for the
seed image. Why is it not sufficient to send in a binary image of the
seed points as the seed image? If only the seed points are required for
the filter, can I not set the stopping value for the Fast Marching to 1
and get the same result for the segmentation?
 
- Aidin
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