Couinaud liver segments on CT

TotalSegmentator divides the liver on abdominal CT into Couinaud segments 1 to 8: the caudate lobe (1), left lateral (2 and 3), left medial (4), right anterior (5 and 8), and right posterior (6 and 7). CT volumetry of each segment lets researchers compare groups, follow change between scans, and place lesions by segment. On PET or SPECT, uptake can be read per segment, useful when the liver serves as a reference region.

Find answers to research questions like: How does each segment's share of the liver vary with age, sex, and body size? How do segment volumes change between a baseline and a follow-up scan? Which liver segment gives the steadiest reference uptake?

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Axial slice of chest to pelvis CT, outlined: Liver segment 1, Liver segment 3, Liver segment 4, Liver segment 5, Liver segment 6, Liver segment 7, Liver segment 8
Axial
Sagittal slice of chest to pelvis CT, outlined: Liver segment 1, Liver segment 2, Liver segment 3, Liver segment 4, Liver segment 5, Liver segment 6, Liver segment 7, Liver segment 8
Sagittal
Coronal slice of chest to pelvis CT, outlined: Liver segment 1, Liver segment 2, Liver segment 3, Liver segment 4, Liver segment 5, Liver segment 8
Coronal

Found in this example

  • Liver segment 1
  • Liver segment 2
  • Liver segment 3
  • Liver segment 4
  • Liver segment 5
  • Liver segment 6
  • Liver segment 7
  • Liver segment 8

Example scan: chest to pelvis CT, TotalSegmentator dataset