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Table 4 Systematic errors, random errors and margins calculated for each axis (in mm)

From: A comparison of two systems of patient immobilization for prostate radiotherapy

   Systematic error Random error Margin calculated
AP Alpha cradle 0.42 1.0 1.8
Hipfix 0.58 1.2 2.3
CC Alpha cradle 0.48 1.2 2.1
Hipfix 2.13 4.2 8.3
ML Alpha cradle 0.92 1.5 3.4
  Hipfix 0.44 1.1 1.9