LN coverage was similar in all groups , with all of the vascular-expansion techniques ( RTOG , modified RTOG , and PIVOTAL ) , resulting in larger CTVs than that of the RMH technique ( mean volumes : 287.3 cm ( 3 ) , 326.7 cm ( 3 ) , 310.3 cm ( 3 ) , and 256.7 cm ( 3 ) , respectively ) .