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Fig. 4 —Mucosal coverage on 3D endoluminal CT colonography in 59-year-old
woman. Still image from 3D endoluminal fly-through shows visualized surface
(green) after unidirectional navigation along automated centerline in
opposite direction. Typically, more than 20% of endoluminal surface is not
seen during unidirectional navigation with 90° field of view,
necessitating bidirectional navigation. Previously unseen areas are relative
blind spots at optical colonoscopy. Nonstandard 3D displays, such as virtual
dissection view, avoid bidirectional evaluation and may become standard
practice. Increasing field of view may also eliminate need for bidirectional
endoluminal navigation.
