Table 3.

Comparison of sensitivity of cardiac substructure doses to a 5 mm shift in the manual contour. The maximal dose deviation is calculated as the largest deviation in dose observed for 100 realizations of a 5 mm contour shift relative to the dose from manual contouring.

Treatment Laterality	Cardiac Structures	Absolute Maximal Dose Deviation (Gy)			Relative Maximal Dose Deviation (%)
		Mean ± SD	Median	Range	Mean ± SD	Median	Range
Left (n = 40)	LA	0.3 ± 0.3	0.2	0.0–1.5	15 ± 6	14	6–25
	RA	0.5 ± 0.4	0.2	0.0–1.5	19 ± 6	18	8–38
	LV	1.4 ± 0.7	1.2	0.5–3.9	32 ± 13	28	16–65
	RV	6.1 ± 3.6	6.2	0.9–15.0	129 ± 12	127	108–174
	LAD	4.4 ± 2.4	4.3	1.3–15.1	58 ± 32	45	10–160
	LADmax	13.4 ± 6.9	11.4	2.0–29.5	77 ± 61	56	8–234
Right (n = 30)	LA	0.4 ± 0.4	0.2	0.1–1.5	15 ± 4	15	8–24
	RA	1.2 ± 0.6	1.0	0.5–2.8	30 ± 15	29	11–76
	LV	0.2 ± 0.2	0.1	0.0–0.6	16 ± 6	17	4–26
	RV	0.6 ± 0.5	0.4	0.1–1.7	22 ± 8	22	7–36
	LAD	0.6 ± 0.8	0.2	0.0–2.5	19 ± 9	18	7–51
	LADmax	0.9 ± 1.0	0.4	0.1–3.2	21 ± 18	16	8–98