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Table 4 Included angle between fissures and tangent lines showing a clear or barely clear five-line sign using the standard algorithm

From: Comparison of the rebuilding effects of different computed tomography scanners and reconstructive settings for the five-line sign in normal interlobular fissures

Locations 16-slice 256-slice
Cases Included angle, degrees Range, degrees Cases Included angle, degrees Range, degrees
M (P25, P75) (P2.5, P97.5) M (P25, P75) (P2.5, P97.5)
Right upper 50 − 27.00 (− 31.15, − 20.75) − 54.33 ~ − 2.10 48 − 27.50 (− 31.00, − 19.25) − 40.87 ~ − 2.35
Right middle 50 − 0.50 (− 18.00, 17.00) − 43.35 ~ 37.80 49 − 3.00 (− 13.00, 11.00) − 37.50 ~ 31.00
Right lower 50 − 34.50 (− 39.00, − 31.50) − 45.72 ~ − 23.00 49 − 33.00 (− 36.00, − 28.00) − 44.00 ~ − 21.00
Left upper 50 − 31.50 (− 37.00, − 28.00) − 45.72 ~ − 16.28 48 − 33.00 (− 38.50, − 29.00) − 45.55 ~ − 20.22
Left middle 50 − 32.00 (− 36.00, − 30.00) − 40.18 ~ − 6.42 49 − 32.00 (− 35.00, − 28.00) − 41.00 ~ − 17.25
Left lower 50 − 36.00 (− 42.00, − 31.75) − 46.45 ~ − 22.00 49 − 34.00 (− 37.50, − 31.00) − 46.00 ~ − 21.25
H   113.97    125.57  
p*   < 0.001    < 0.001  
  1. “−” Indicates direction only; the absolute values of included angles represent the size
  2. *Differences in angles between fissures and the tangent lines among six locations using the same computed tomography scanner were significant