Table 1.

Evaluation Parameters of NC-VMAT, C-VMAT, IMRT, and CK Plans (Mean ± SD).^a

Parameter	NC-VMAT	C-VMAT	P	IMRT	P	CK	P
GI	4.21 ± 1.38	4.87 ± 1.35	.001	5.36 ± 1.98	.001	3.49 ± 0.65	.015
CI	0.87 ± 0.03	0.86 ± 0.04	.008	0.85 ± 0.05	.002	0.86 ± 0.07	.281
MUs	3 105.20 ± 371.23	2 997.27 ± 446.84	.065	4 128.40 ± 1 185.38	.002	28 733.59 ± 7 197.85	.001
BT/min	2.61 ± 0.07	2.30 ± 0.23	.001	2.95 ± 0.85	.173	30.25 ± 7.32	.001

Abbreviations: BT, beam on time; CI, conformity index; CK, CyberKnife; C-VMAT, coplanar volumetric modulated arc therapy; GI, gradient index; IMRT, intensity-modulated radiation therapy; NC-VMAT, noncoplanar volumetric modulated arc therapy; MUs, monitor units; SD, standard deviation.

^a Statistical significance was tested for each technology in comparison with NC-VAMT.