Table 2. Dosimetric comparison between VMAT-5B and VMAT-10B for the OARs.

Parameters	VMAT-5B	VMAT-10B	P value
Left lung
V5Gy (%)	51.16 ± 3.61	53.17 ± 3.82	<0.001
V20Gy (%)	23.11 ± 2.26	23.67 ± 2.33	<0.001
V30Gy (%)	15.21 ± 1.54	15.46 ± 1.54	<0.001
V40Gy (%)	8.67 ± 1.32	8.71 ± 1.34	0.445
Dmean (Gy)	12.53 ± 0.91	12.80 ± 0.93	<0.001
Heart
V5Gy (%)	22.01 ± 4.50	24.59 ± 4.07	<0.001
V20Gy (%)	3.20 ± 1.49	3.35 ± 1.50	<0.001
V30Gy (%)	1.17 ± 0.89	1.21 ± 0.90	<0.001
Dmean (Gy)	4.43 ± 0.53	4.71 ± 0.50	<0.001
D1cc (Gy)	38.03 ± 5.99	38.03 ± 5.66	0.880
Right lung
V5Gy (%)	22.54 ± 6.27	23.22 ± 6.21	<0.001
V20Gy (%)	0.30 ± 0.40	0.30 ± 0.37	0.859
Dmean (Gy)	3.84 ± 0.54	3.90 ± 0.53	0.001
Right breast
V5Gy (%)	20.14 ± 5.76	19.84 ± 5.57	0.011
Dmean (Gy)	3.88 ± 0.47	3.86 ± 0.45	0.076
D1cc (Gy)	14.29 ± 2.60	13.94 ± 2.49	<0.001

The values in bold indicate significant differences.