Fig. 3From: Electronic cleansing in computed tomography colonography using AT layer identification with integration of gradient directional second derivative and material fraction model a a CTC image with the ambiguous layers. The yellow dash circle contains an AT layer and an ATT layer where an AT layer is pointed by the blue arrow while an ATT layer is pointed by the red arrow. b the locations of ambiguous layers in a binary image. c the locations of AT layers in a CTC image. d the locations of AT layers in a binary image. e the locations of STT layers in a CTC image. f the locations of STT layers in a binary imageBack to article page