Figure 1.

(a) Enhanced-depth optical coherence tomography image. (b) The image was binarized using Niblack’s auto-local threshold. (c) The color threshold tool was used to select the dark pixels, representing the luminal area

(a) Enhanced-depth optical coherence tomography image. (b) The image was binarized using Niblack’s auto-local threshold. (c) The color threshold tool was used to select the dark pixels, representing the luminal area