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Table 2 List of implemented manual interventions

From: Identification of dental root canals and their medial line from micro-CT and cone-beam CT records

Name Description
M1 Overrule the decision dictated by the decision tree.
M2 Change the local threshold to any desired value.
M3 Discard some of the automatically detected dark spots.
M4 Unify several dark spots using a parametric active contour
  model (snake) initialized by the user.