Table 3.

Differences between pre‐ and post‐treatment, determined by ExacTrac respiratory‐triggered images at full exhale phase.

Case# : Fraction#	A/P (mm) a , b	S/I (mm)	L/R (mm)
case1 : fx2	$-1.3$	$-0.5$	0.2
case3 : fx2	$-0.3$	1.3	0.1
case4 : fx1	$-1.4$	0.1	$-1.0$
case6 : fx5	$-0.1$	$-0.4$	0.0
Mean	$-0.8$	0.1	$-0.2$

^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 pre‐treatment relative to post‐treatment shifts were: $+\text{posterior}$; $+\text{superior}$; $+\text{right}$.