Table 3.

Setup Margin Characteristics: Assessment of Differences Between Planar kV and CBCT in 3 Dimensions (mm).

	Before Online Setup Correction			After Online Setup Correction
	LR	AP	SI	LR	AP	SI
CBCT	3.81	−1.39	1.41	0.54	0.00	0.50
Planar kV	6.21	5.57	0.44	0.09	3.20	1.38
P Value	.748	.003	.099	.809	.003	.643

Abbreviations: AP, anteroposterior (posterior = negative, anterior = positive); LR, lateral (left = negative, right = positive); M, mean setup error; SI, superoinferior (inferior = negative, superior = positive); Σ, systematic setup error; σ, random setup error.