Table 2:

Dosimetric Parameters by Arm

	Mean (SD)
	Overall	Free-breathing 3DCRT (n=26)	IMRT with DIBH (n=28)	P-value
Ipsilateral Lung:
Mean dose	14.02 (1.82)	14.44 (1.96)	13.62 (1.62)	0.035
V5	52.63 (7.06)	53.08 (6.99)	52.22 (7.23)	0.47
V10	40.53 (6.53)	40.03 (5.98)	41.00 (7.08)	0.97
V15	34.07 (5.15)	33.81 (5.43)	34.31 (4.96)	0.99
V20	29.40 (4.42)	29.55 (4.88)	29.26 (4.03)	0.51
V25	25.38 (4.06)	26.07 (4.44)	24.74 (3.63)	0.08
V30	21.30 (4.19)	22.73 (4.16)	19.96 (3.83)	0.003
V35	16.98 (4.56)	19.07 (3.99)	15.04 (4.23)	<0.001
V40	11.82 (4.41)	13.83 (3.83)	9.95 (4.12)	<0.001
V45	6.24 (3.46)	7.18 (3.39)	5.36 (3.35)	0.06
V50	2.06 (1.94)	2.19 (1.99)	1.95 (1.92)	0.68
V55	0.37 (0.70)	0.43 (0.83)	0.31 (0.56)	0.97
V60	0.06 (0.26)	0.11 (0.36)	0.02 (0.10)	0.60
Left Ventricle:
Mean dose	2.75 (0.99)	3.22 (0.77)	2.32 (0.98)	<0.001
V5	10.53 (10.49)	15.81 (8.65)	5.62 (9.73)	<0.001
V10	1.53 (2.47)	2.09 (2.24)	1.01 (2.60)	<0.001
V15	0.39 (0.84)	0.51 (0.74)	0.28 (0.93)	0.003
V20	0.09 (0.24)	0.16 (0.32)	0.02 (0.06)	0.002
V25	0.03 (0.10)	0.06 (0.13)	0.00 (0.01)	0.006
V30	0.01 (0.03)	0.01 (0.04)	0.00 (0.00)	0.009
V35	0.00 (0.01)	0.00 (0.01)	0.00 (0.00)	0.03
V40	0.00 (0.00)	0.00 (0.00)	0.00 (0.00)	0.15
V45 (results were identical for V50, V55, and V60)	0.00 (0.00)	0.00 (0.00)	0.00 (0.00)	0.32
Whole Heart:
Mean dose	2.77 (1.18)	3.22 (1.22)	2.35 (0.98)	0.006
Left anterior descending coronary artery:
Mean dose	7.05 (3.31)	8.95 (3.19)	5.29 (2.32)	<0.001