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Table 2 Summary of inter-fraction and intra-fraction translational error and rotational error in each dimension

From: Evaluation of inter-fraction and intra-fraction errors during volumetric modulated arc therapy in nasopharyngeal carcinoma patients

Translational error (mm)
  Initial inter-fraction error Residual inter-fraction error Intra-fraction error
ML SI AP ML SI AP ML SI AP
M −0.3 −0.9 0.8 0 −0.4 0.2 0 −0.2 −0.3
SD 1.5 1.3 1.2 0.7 0.8 0.8 0.5 0.7 0.7
Minimum −5.2 −4.8 −2.9 −2.0 −2.0 −1.9 −1.5 −2.4 −2.8
Maximum 5.0 2.0 4.2 1.8 2.0 2.0 2.1 1.8 0.7
Σ 1.4 1.0 1.0 0.4 0.5 0.4 0.2 0.4 0.4
σ 0.8 0.8 0.7 0.6 0.7 0.7 0.5 0.6 0.6
Rotational error (°)
  Initial inter-fraction error Residual inter-fraction error Intra-fraction error
pitch roll yaw pitch roll yaw pitch roll yaw
M −0.7 −0.2 −0.2 −0.7 −0.1 −0.1 −0.1 0.1 0
SD 0.9 1.4 1.0 0.9 1.4 0.9 0.5 0.5 0.4
Minimum −3.5 −4.4 −4.0 −3.0 −3.0 −3.0 −2.8 −1.2 −1.5
Maximum 2.1 2.9 2.8 1.8 2.9 2.7 1.4 1.5 0.9
Σ 0.7 1.0 0.7 0.7 1.0 0.6 0.3 0.2 0.2
σ 0.6 1.0 0.7 0.6 1.0 0.7 0.5 0.5 0.4
  1. M, mean of all patients’ mean; SD, standard deviation; Σ, systematic setup uncertainty; σ, random setup uncertainty; ML, medial–lateral; SI, superior–inferior; AP, anterior–posterior.