Table 2.

Differences between two breathing phases: full exhale and full inhale, determined by ExacTrac respiratory‐triggered images.

Case# : Fraction#	A/P (mm) a , b	S/I (mm)	L/R (mm)
case1 : fx3	$-1.4$	$-0.8$	$-0.8$
case3 : fx1	0.5	0.1	$-0.6$
case3 : fx2	0.7	$-1.7$	0.0
case3 : fx3	0.8	0.7	2.0
case3 : fx4	1.0	$-1.4$	0.8
case4 : fx1	0.4	$-0.8$	1.2
Mean	0.3	$-0.6$	0.4

^a $\mathrm{A}/\mathrm{P}=\text{anterior}/\text{posterior}$; $\mathrm{S}/\mathrm{I}=\text{inferior}/\text{superior}$; $\mathrm{L}/\mathrm{R}=\text{left}/\text{right}$.

^bThe directions of ExacTrac image guidance shifts at full exhale phase relative to full inhale phase shifts were: $+\text{posterior}$; $+\text{superior}$; $+\text{right}$.