Table 1. PTV coverage based on DVH analysis.

Parameters	3DCRT-FinF	5F-IMRT	2P-VMAT	F	p1	p2	p3
D2%	55.50 ± 0.71	54.00 ± 0.51	54.93 ± 0.87	11.20	< 0.001	< 0.194	0.019
D98%	44.18 ± 0.56	48.29 ± 0.30	47.77 ± 0.35	285.72	< 0.001	< 0.001	0.026
V95%	78.23 ± 4.25	99.16 ± 0.33	98.45 ± 0.51	229.81	< 0.001	< 0.001	0.797
V110%	4.26 ± 3.73	0.22 ± 0.43	2.09 ± 3.38	4.81	0.022	0.466	0.309
HI	0.235 ± 0.017	0.114 ± 0.012	0.143 ± 0.025	122.63	< 0.001	< 0.001	0.002
CI	0.27 ± 0.07	0.64 ± 0.07	0.68 ± 0.07	102.79	< 0.001	< 0.001	0.425
MU	456.10 ± 20.98	1021.10 ± 343.10	403.60 ± 31.60	29.51	0.002	0.001	0.001

Abbreviations: Vx = volume (%) receiving x dose (Gy) or higher; 3DCRT-FinF = three-dimensional conformal radiotherapy using

field-in-field technique; 5F-IMRT = 5-field intensity-modulated radiotherapy; 2P-VMAT = 2-partial arc volumetric modulated arc therapy.

Data presented as mean ± standard deviation. F values from ANOVA analysis (α = 0.05). p1: 3DCRT & 5F-IMRT;

p2: 3DCRT-FinF & 2P-VMAT; p3: 5F-IMRT & 2P-VMAT. D_2% = the maximum dose; D_98% = the minimum dose.