TABLE 6.

Comparison of the incidence (in %) with different levels of “volume of regret” (VoR) between MI and SI plans

		VoR
		≤ 2%		2%–5%		5%–10%		≥10%
		MI plan	SI plan	MI plan	SI plan	MI plan	SI plan	MI plan	SI plan
Shift	Magnitude	(%Plan)	(%Plan)	(%Plan)	(%Plan)	(%Plan)	(%Plan)	(%Plan)	(%Plan)
Translational	+0.5 mm	23.9	34.8	45.7	37.0	28.3	26.1	2.2	2.2
	–0.5 mm	21.7	19.6	41.3	34.8	32.6	39.1	4.3	6.5
	+1 mm	0	0	17.4	19.6	28.3	30.4	54.3	50.0
	–1 mm	0	0	8.7	13.0	26.1	26.1	65.2	60.9
	+1.5 mm	0	0	6.5	4.3	17.4	21.7	76.1	73.9
	–1.5 mm	0	0	0	0	13.0	15.2	87.0	84.8
	+2 mm	0	0	0	0	8.7	8.7	91.3	91.3
	–2 mm	0	0	0	0	2.2	0	97.8	100.0
Rotational	+0.5${}^{\circ }$	93.5	69.6	4.3	28.3	2.2	2.2	0	0
	–0.5${}^{\circ }$	97.8	82.6	2.2	15.2	0	2.2	0	0
	+1.0${}^{\circ }$	89.1	45.7	10.9	30.4	0	17.4	0	6.5
	–1.0${}^{\circ }$	100.0	52.2	0	26.1	0	15.2	0	6.5
	+1.5${}^{\circ }$	95.7	32.6	4.3	23.9	0	21.7	0	21.7
	–1.5${}^{\circ }$	100.0	39.1	0	28.3	0	15.2	0	17.4
	+2.0${}^{\circ }$	87.0	19.6	13.0	30.4	0	13.0	0	37.0
	–2.0${}^{\circ }$	91.3	23.9	8.7	32.6	0	10.9	0	32.6

VoR = % volume of PTV not covered by prescribed isodose.

%Plan = number of plans/total number of plans x 100%.