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Fig. 1A. —Principles of virtual colon dissection. Schematic of virtual
colon dissection shows central colonic path (P) defined semiautomatically.
Virtual camera is oriented perpendicular to this path. Camera displays 3D
panel of inner colonic surface with 90° field of view. To view entire
inner colonic surface, 90° camera field of view is rotated in 45°
increments around path (curved arrows). Subsequent image panels are
rendered by rotation around path.
