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Table 2 Amplitudes of respiration-induced liver motion of each liver segment during expiration period in free breathing

From: Quantitative analysis of respiration-induced motion of each liver segment with helical computed tomography and 4-dimensional computed tomography

Segment Average amplitude ± SD (mm)
LR AP SI
S1 −2.0 ± 2.6 1.0 ± 1.3 5.5 ± 2.6
S2 0.3 ± 2.2 1.2 ± 3.5 6.3 ± 4.2
S3 −0.3 ± 1.9 2.4 ± 1.4 5.8 ± 2.8
S4a −1.4 ± 3.3 1.5 ± 2.4 3.0 ± 2.6
S4b − 1.2 ± 1.6 2.0 ± 1.9 5.3 ± 3.4
S5 − 0.2 ± 2.1 3.2 ± 2.0 5.5 ± 2.4
S6 − 0.1 ± 4.6 2.2 ± 2.3 6.5 ± 3.5
S7 − 1.4 ± 3.8 3.5 ± 2.5 8.6 ± 3.4
S8 1.0 ± 2.6 3.3 ± 2.3 5.0 ± 3.3
mean −0.6 ± 3.0 2.3 ± 2.4 5.7 ± 3.4
  1. Positive values denote excursion in the left, posterior, or superior directions; Negative values, right, anterior, or inferior
  2. Abbreviations: LR left-right, AP anterior-posterior, SI superior-inferior, SD standard deviation