Table 10. Comparisons of calculated margins for planning target volumes with those of previous studies considering both inter- and intra-fractional variations.

Author	Image guide method	Margin recipe	Calculated margin (mm)
			RL	SI	AP
Cacicedo et al.[22]	EPID	2∑ + 0.7σ	3.6	3.3	3.5
		2.5∑ + 0.7σ	4.2	3.9	4.1
This study	ExacTrac	2∑ + 0.7σ	3.04	3.75	4.19
		2.5∑ + 0.7σ	3.70	4.52	5.12

Abbreviation: RL, right-left; SI, superior-inferior; AP, anterior-posterior; EPID, electronic portal imaging device