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. Author manuscript; available in PMC: 2022 Feb 1.
Published in final edited form as: Med Image Anal. 2020 Dec 16;68:101896. doi: 10.1016/j.media.2020.101896

Fig. 2.

Fig. 2.

Graphical illustration of the main idea. (A) The complete sigmoid colon (light blue) is connected to rectum (not shown). The yellow line indicates the superior-most mask of the rectum. (B) Starting at the rectum mask and moving towards the superior direction, only a portion of the sigmoid is segmented slice by slice (dark blue). (C) At the superior most slice, we iterate for the second time but towards the inferior direction to further segment a descending section of the sigmoid. (D) This process is repeated once more in the third sweep to fully segment the sigmoid colon. Directions of segmentation in sweeps are indicated by the red arrows. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)