Error in network detection in vmtk

Hi all,

I am trying to do the centerline computation and network extraction for a volume.

The network extraction is fine for most of the volume, but at one point it seems to break down and gives a false detection. [On the bottom, the very dense center of branches]

Would anyone know why this is happening?

P.S: I also tried the network extraction on other volumes, and it always seems to have one such over dense center.

Image 1: only network, with the visible error
Image 2: segmentation + network
Image 3: segmentation + centerline