Table 4.

Comparison of standard deviations (SD) in mm of intra-fraction positioning errors found in the literature as well as the Pos_Old and Pos_New positioning systems

Authors	Positioning systems	SD (mm) for intra-fraction CBCT
Hyde et al	Elekta BodyFIX system	LR = 0.6; CC = 0.5 and AP = 0.5
Our center	Pos_New	LR = 0.5; CC = 0.5 and AP = 0.7
Dahele et al	Posirest	LR = 0.9; CC = 0.6 and AP = 0.7
Li et al	Elekta BodyFIX system	LR = 0.9, CC = 0.7 and AP = 0.9
Li et al	Evacuated cushion	LR = 1.3; CC = 1.2 and AP = 1.0
Li et al	Thermoplastic S-frame	LR = 1.3, CC = 0.9, and AP = 1.1
Foster et al	Evacuated cushion	LR = 1.05; CC = 1.23 and AP = 1.04
Our center	Pos_Old	LR = 0,9; CC = 1,5 and AP = 0,7