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Table 2 The group mean (M), SD of systematic errors (Σ), root mean square of SDs of random errors (σ), and the estimated margin required to compensate for the interfractional tumor position variation in each orthogonal direction for the four subgroups of markers and all markers (Overall)

From: Comparison of carina-based versus bony anatomy-based registration for setup verification in esophageal cancer radiotherapy

  LR (mm) CC (mm) AP (mm)
Bony anatomy Carina Bony anatomy Carina Bony anatomy Carina
Proximal (n = 12) M 0.1 −1.3 −1.2 0.5 − 0.7 1.0
Σ 1.5 1.7 4.1 3.3 1.9 3.3
σ 1.3 1.6 1.5 1.9 1.2 1.6
2.5 Σ + 0.7σ 4.4 5.5 11.3 9.7 5.5 9.3
Mid-thoracic (n = 11) M −1.1 −1.5 −2.3 −1.0 1.2 0.8
Σ 3.1 2.7 2.9 1.7 3.2 1.8
σ 1.5 1.6 2.0 2.8 2.3 2.3
2.5 Σ + 0.7σ 8.9 8.0 8.6 6.1 9.6 6.1
Distal (n = 31) M 0.4 0.8 −0.8 0.5 0.5 −0.8
Σ 1.9 2.2 4.2 4.1 1.9 4.5
σ 1.9 2.7 2.5 2.2 1.4 3.1
2.5 Σ + 0.7σ 6.1 7.4 12.1 11.7 5.7 13.4
Cardia (n = 11) M −1.1 −1.2 −1.2 0.9 −0.1 1.7
Σ 5.4 6.1 4.9 4.0 1.9 3.6
σ 4.3 5.1 3.2 3.7 2.4 4.7
2.5 Σ + 0.7σ 16.4 18.9 14.6 12.5 6.4 12.2
Overall (n = 65) M −0.2 −0.3 −1.2 0.3 0.3 0.2
Σ 2.9 3.3 4.1 3.6 2.2 3.9
σ 2.4 3.0 2.4 2.6 1.8 3.1
2.5 Σ + 0.7σ 8.9 10.4 11.9 10.8 6.8 11.8