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Table 1 Positioning deviations of isocenter relocation at CT verification before and during radiation treatment.

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

  pre-treatment 2 weeks 4 weeks end of treatment
Direction (mm) mean (SD) mean (SD) mean (SD) mean (SD)
Craniocaudal 0.3 (0.4) 0.3 (0.5) 0.3 (0.6) 0.4 (0.5)
Mediolateral 0.1 (0.3) 0.1 (0.4) 0.2 (0.4) 0.2 (0.4)
Anteroposterior 0.1 (0.4) 0.2 (0.4) 0.2 (0.4) 0.2 (0.5)
3D-displacement 0.5 (0.4) 0.5 (0.4) 0.6 (0.4) 0.6 (0.5)
  1. SD, standard deviation