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Table 4 Inter-observer variability for IG-4D and IG-ITV separately in left-right direction (LR), superior-inferior direction (SI) and anterior-posterior direction (AP)

From: Accuracy and inter-observer variability of 3D versus 4D cone-beam CT based image-guidance in SBRT for lung tumors

   Variability as standard deviation between observers Variability as maximum range between observers
   LR[mm] SI[mm] AP[mm] LR[mm] SI[mm] AP[mm]
IG-4D All observers 0.3 0.6 0.3 0.9 1.8 0.7
ROs 0.3 0.5 0.2 0.6 0.9 0.4
RTTS 0.3 0.4 0.3 0.5 0.8 0.6
IG-ITV All observers 0.8 1.5 1.0 2.2 3.8 2.8
ROs 0.8 1.6 0.9 1.6 3.1 1.7
RTTS 0.6 1.2 0.9 1.1 2.2 1.8
  1. Inter-observer variability is shown for all six observers and separately for the three ROs and three RTTs.