Dear Bernard,
 you can find the details in my IEEE TMI paper from 2004:
Antiga L and Steinman DA. Robust and objective decomposition and mapping of 
bifurcating vessels. IEEE Transactions on Medical Imaging, 23(6): 704-713, June 
2004.

and also here
http://www.vmtk.org/Tutorials/BranchSplitting/

In short, ICA (ECA) reference points are located where the ICA (ECA)
cross the tube surface of the ECA (ICA). The CCA reference points are 
located one inscribed sphere radius away from each ICA and ECA points
in the upstream direction.

Hope this helps


Luca


On Jun 6, 2012, at 3:42 PM, Bernard Chiu wrote:

> Dear vmtk users
> 
> In the output of the vmtkBifurcationVectors filter, there are three
> points, one for each of the CCA, ICA and ECA. I know how the ICA and
> ECA reference points were defined, but how was the CCA reference point
> defined?
> 
> Thanks,
> Bernard
> 
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