Table 3.

Dosimetric parameters for PTV of three plans.

Parameters	IMRT	VMAT	HT	p*
				VMAT vs. IMRT	HT vs. IMRT	HT vs. VMAT
PTV70
Dmean (Gy)	72.10 ± 0.49	72.24 ± 0.37	70.63 ± 0.23	0.117	<0.001	<0.001
HI	0.07 ± 0.01	0.07 ± 0.01	0.03 ± 0.01	0.217	<0.001	<0.001
CI	0.75 ± 0.04	0.76 ± 0.03	0.82 ± 0.04	0.086	<0.001	<0.001
PTVnd
Dmean (Gy)	72.11 ± 0.52	72.30 ± 0.25	70.63 ± 0.25	0.409	<0.001	<0.001
HI	0.07 ± 0.02	0.07 ± 0.02	0.03 ± 0.01	0.726	<0.001	<0.001
CI	0.77 ± 0.05	0.78 ± 0.04	0.82 ± 0.04	0.184	<0.001	<0.001
PTV59.4
Dmean (Gy)	62.50 ± 0.60	62.47 ± 0.49	60.85 ± 0.43	0.765	<0.001	<0.001
HI	0.17 ± 0.04	0.17 ± 0.04	0.11 ± 0.01	0.082	<0.001	<0.001
CI	0.65 ± 0.08	0.66 ± 0.08	0.76 ± 0.08	0.016	<0.001	<0.001

*P value was computed by paired t test.