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Table 1 Overview of the setup differences between AlignRT and CBCT (target volume and surface registered)

From: Evaluation of a 3D surface imaging system for deep inspiration breath-hold patient positioning and intra-fraction monitoring

  AlignRT / CBCT target volume AlignRT / CBCT surface
LR (mm) CC (mm) AP (mm) LR (mm) CC (mm) AP (mm)
M 0.1 −0.5 1.7 0.1 0.6 0.4
Σ 1.8 1.4 1.9 1.0 1.4 1.5
σ 1.4 1.6 1.9 1.2 1.4 1.0
M - 1.96 x SD −4.4 −4.3 −3.3 −2.8 −3.5 − 3.0
M + 1.96 x SD 4.5 3.2 6.6 3.1 4.7 3.8
R 2 0.43 0.53 0.35 0.74 0.44 0.64
  1. M Group mean, Σ The systematic error, σ The random error, M ± 1.96 x SD The 95% limits of agreement, R2 The Pearson correlation coefficient, LR Left-right, CC Cranial-caudal, AP Anterior-posterior