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Table 2 Mean and standard deviation of overall, systematic, and random setup errors at portal images during the treatment (n = 456)

From: Fractionated stereotactic radiotherapy for skull base tumors: analysis of treatment accuracy using a stereotactic mask fixation system

   Distribution of displacements (1 SD, mm)
  Overall displacement Overall Systematic Random
  (mm) (n = 456) (n = 16) (n = 456)
Mediolateral 0.3 0.9 0.7 0.5
Anteroposterior -0.2 1 0.8 0.6
Craniocaudal 0.2 1.1 0.9 0.7
  1. SD, standard deviation