Table 1.

Statistical comparison of dosimetric parameters for $(\mathrm{n}=13)$ fixed‐field IMRT vs. ${\text{VMAT}}_{\mathrm{I}}$ (single arc) plans, and ${\text{VMAT}}_{\mathrm{I}}$ vs. ${\text{VMAT}}_{\text{II}}$ (two arc) plans.

		IMRT				${\mathrm{V}\mathrm{M}\mathrm{A}\mathrm{T}}_{\mathrm{I}}$				IMRT vs. ${\mathrm{V}\mathrm{M}\mathrm{A}\mathrm{T}}_{\mathrm{I}}$ p	${\mathrm{V}\mathrm{M}\mathrm{A}\mathrm{T}}_{\mathrm{I}}$ vs. ${\mathrm{V}\mathrm{M}\mathrm{A}\mathrm{T}}_{\mathrm{I}\mathrm{I}}$ p
Target OARs	Dose Metrics	Median	Max.	Min.	SD	Median	Max.	Min.	SD
PTV	D99 (Gy)	47.3	48.1	44.1	1.1	47.6	48.4	45.6	0.7	0.47	0.76
	Mean Dose (Gy)	50.2	50.9	49.4	0.4	50.0	50.8	49.4	0.4	0.12	0.78
	D95 (Gy)	48.2	49.3	46.0	0.9	48.3	49.1	47.7	0.3	0.76	0.95
	${\mathrm{V}95}_{47.5\mathrm{G}\mathrm{y}(95\mathrm{\%})}(\mathrm{\%})$	98.5	99.6	95.0	1.5	99.1	99.6	97.4	0.8	0.38	0.80
	${\mathrm{D}}_{max}\hspace{0.17em}(\mathrm{G}\mathrm{y})$	53.5	54.9	52.9	0.7	52.7	53.8	51.5	0.8	0.02	0.78
	Conf.Number (frac.)	0.8	0.9	0.6	0.1	0.8	0.9	0.8	0.1	0.04	0.26
Both Lungs	Mean (Gy)	10.8	16.2	3.8	3.3	9.8	14.8	4.2	2.9	0.62	0.86
	V20 (%)	19.0	34.4	5.8	7.7	14.5	27.8	3.0	6.4	0.05	0.77
	V5 (%)	53.3	65.3	16.6	15.0	60.4	68.2	24.0	13.9	0.35	0.93
Liver	V30 (%)	9.4	23.6	0.0	7.3	9.6	16.1	0.0	4.8	0.70	0.90
Heart	V45 (%)	11.4	25.8	3.3	5.5	12.4	23.0	3.8	5.9	0.80	0.78
RT Kidney	Mean (Gy)	2.9	11.8	0.2	2.8	2.2	9.6	0.2	2.7	0.96	0.94
	V22.5 (%)	0.0	1.4	0.2	0.6	0.0	4.2	0.0	1.2	0.41	0.88
LT Kidney	Mean (Gy)	3.1	11.6	0.2	3.7	3.8	9.1	0.2	3.3	0.84	0.98
	V22.5 (%)	0.0	1.4	0.2	0.6	0.0	4.2	0.0	1.2	0.64	0.99
3mm prv Canal	Max (Gy)	41.8	45.1	31.7	3.9	42.1	47.8	31.3	4.7	0.47	0.57
Monitor Units	MUs	364.0	448.0	309.0	39.2	313.0	381.0	271.0	25.8	0.001	0.10