Volumetric Modulated Arc Radiotherapy for Early Stage Non-Small-Cell Lung Carcinoma: Is It Better Than the Conventional Static Beam Intensity Modulated Radiotherapy?

Table 3

Dose comparison among the 3 techniques for the organs at risk (OARs).

OAR	Parameter	C-IMRT	SA-VMAT	DA-VMAT	ANOVA; 𝑃 value
Spinal cord	𝐷max (Gy)	33.3 ± 7.6	34.1 ± 12.4	35.0 ± 7.6	0.670
Whole lung	𝐷mean (Gy)	10.3 ± 2.0	11.6 ± 5.3	12.0 ± 3.4	0.045
	𝑉20 (%)	18.8 ± 4.8	18.0 ± 5.1	19.5 ± 5.2	0.514
	𝑉10 (%)	34.5 ± 7.7	36.4 ± 8.8	39.0 ± 11.0	0.311
	𝑉5 (%)	51.5 ± 1.09	50.6 ± 10.6	53.3 ± 9.7	0.284
Ipsilateral lung	𝐷mean (Gy)	18.2 ± 6.5	15.5 ± 7.9	17.5 ± 7.0	0.121
	𝑉20 (%)	39.2 ± 3.9	29.6 ± 6.2	36.3 ± 4.8	0.088
Contralateral lung	𝐷mean (Gy)	6.6 ± 2.6	8.9 ± 4.4	7.8 ± 2.9	0.143
	𝑉20 (%)	6.3 ± 7.0	13.8 ± 13.2	10.0 ± 8.6	0.002
Heart	𝐷mean (Gy)	13.0 ± 12.9	13.9 ± 13.5	12.7 ± 11.3	0.497
	𝑉40 (%)	11.6 ± 16.0	13.0 ± 18.7	10.2 ± 14.6	0.223