Table 4.

Mean and standard deviation of the anterior‐posterior, right‐left, and superior‐inferior shifts after patient position correction within the immobilization mask guided by kV on‐board imaging shown in Fig. 5.

	A‐P (mm)	R‐L (mm)	S‐I (mm)
Mean	$-0.7$	0.5	$-1.0$
Stand. Dev.	1.2	0.7	1.6
P‐Value	0.00320	0.00150	0.00260