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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