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Table 4 Inter-fraction errors.

From: Semi-robotic 6 degree of freedom positioning for intracranial high precision radiotherapy; first phantom and clinical results

  Translations (mm) Rotations (°)
  X Y Z x y z
M 0 0.6 0 0.02 0.06 0.18
Σ 0.7 0.8 0.5 0.02 0.06 0.18
σ 0.8 0.1 0.7 0.26 0.28 0.44
  1. Results were obtained from registration of planning CT-with cone-beam CT (CBCT1), based on the cranium as region of interest, using grey value matching. group mean error(M), standard deviation(SD) of systematic errors(Σ), root-mean-square of random errors(σ)