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Table 1 Patient set-up error (mm) for each scenario in three dimensions

From: Impact of the frequency of online verifications on the patient set-up accuracy and set-up margins

   Direction
   AP Lateral SI
Anatomical region FOV M Σ σ M Σ σ M Σ σ
Head and Neck 0% 0.3 0.9 1.6 -0.3 1.3 1.6 0.6 1.5 2.2
Chest 0% 0.7 2.4 2.7 -0.3 2.2 2.7 0.5 1.7 2.4
Abdomen 0% 0.6 3.0 3.3 -0.9 2.4 3.0 -0.8 3.6 3.1
Pelvis 0% 0.9 2.3 3.2 -0.3 1.8 2.7 1.0 3.2 2.5
Head and Neck 20% 0.2 0.8 1.4 -0.3 1.1 1.4 0.4 1.1 1.9
Chest 20% 0.5 1.7 2.2 -0.3 1.7 2.4 0.3 1.4 2.1
Abdomen 20% 0.6 2.3 3.1 -0.5 1.6 2.7 -0.4 2.6 3.0
Pelvis 20% 0.6 1.7 2.9 -0.4 1.5 2.4 0.9 2.6 2.3
Head and Neck 50% 0.1 0.5 1.1 -0.1 0.6 1.2 0.2 0.6 1.3
Chest 50% 0.3 0.9 1.6 -0.2 1.1 2.0 0.2 0.8 1.6
Abdomen 50% 0.4 1.5 2.5 -0.2 1.1 2.5 -0.4 1.7 2.8
Pelvis 50% 0.5 1.3 2.4 -0.2 1.1 1.9 0.6 1.4 2.0
  1. Abbreviations: M = Overall population mean set-up error; Σ = Population systematic error; σ = Population random error; AP = anteroposterior; SI = superoinferior; FOV = Frequency of online verifications; 0% = No online verification; 20% = Online verification once a week; 50% = Online verification every other day.