Hi Markus,
your suggestion is completely plausile. However, consider the case of large irregular masks. One could dilate a given waypoint by say one voxel in 3D and use this as the termination mask -> here, however, one has no real way of defining what's proximal and what's distal. This is the exact problem that led me to ask if there isn't some set theoretical way of defining probability of termination...
Regards,
Stefan
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