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Table 1 Implemented spot selection protocols

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

Name Description
P1 - Only one spot Always extracts the largest dark spot from the slice.
P2 - At most two/three/four Extracts the second/third/fourth spot if it is present and
  larger than a small threshold size.
P3 - Adaptive It may extract any number of spots, according to some
  predefined rules that concern the size of different spots.