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Table 2 Set-up margins (mm) for each scenario using the van Herk formula [3]

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

   Safety Margin*
Anatomical region FOV AP Lateral SI
Head and Neck 0% 3 4 5
Chest 0% 7 7 5
Abdomen 0% 9 8 11
Pelvis 0% 8 6 9
Head and Neck 20% 2 3 3
Chest 20% 5 5 4
Abdomen 20% 7 5 8
Pelvis 20% 6 5 7
Head and Neck 50% 1 2 2
Chest 50% 3 3 2
Abdomen 50% 5 4 6
Pelvis 50% 4 3 4
  1. Abbreviations: * = 95% of the dose for 90% of the patients; other abbreviations as in Table 1.