Table 2. Summary of systematic and random positional errors stratified by region of interest used for CBCT image registration.

	Target			Nose
	LR (mm)	CC (mm)	AP (mm)	LR (mm)	CC (mm)	AP (mm)
Localization CBCT
Group Mean	-0.54	0.06	-1.24	-0.83	-0.33	-1.80
Systematic Error	0.47	1.18	0.50	0.52	1.74	0.28
Random Error	0.78	1.08	0.53	0.88	1.29	0.52
Verification CBCT
Group Mean	0.04	-0.18	-0.02	-0.31	-0.53	-0.63
Systematic Error	0.16	0.14	0.17	0.47	0.81	0.68
Random Error	0.32	0.34	0.32	0.46	0.65	1.09
Post-Treatment CBCT
Group Mean	0.04	-0.06	-0.19	-0.33	-0.36	-0.68
Systematic Error	0.25	0.18	0.22	0.53	0.70	0.48
Random Error	0.38	0.43	0.40	0.48	0.58	0.47