Table 1.

Dose objectives and mean dose‐volume histogram results from six IMRT and corresponding VMAT plans, respectively

	Objectives	IMRT	VMAT	p‐test a
$\text{PTV}1\left({\mathrm{V}}_{95}\right)(\%)$		$94.7\pm 2.1$	$94.2\pm 1.3$	0.39
$\text{PTV}1\left({\mathrm{V}}_{105}\right)(\%)$		$4.5\pm 3.5$	$6.3\pm 2.0$	0.49
$\text{PTV}1\left({\mathrm{D}}_{99}\right)(\%)$	95	$90.9\pm 2.8$	$91.4\pm 1.3$	0.13
$\text{PTV}1\left({\mathrm{D}}_1\right)(\%)$	107	$106.7\pm 1.8$	$106.8\pm 0.7$	0.18
$\text{PTV}2*\left({\mathrm{V}}_{95}\right)(\%)$	95	$94.8\pm 3.0$	$95.3\pm 2.4$	0.38
$\text{PTV}2*\left({\mathrm{V}}_{105}\right)(\%)$	10	$20.1\pm 9.0$	$18.3\pm 8.8$	0.21
Lung mean dose (Gy)	8.5	$5.2\pm 0.9$	$4.6\pm 1.5$	0.23
Lung V (%)	50	$32.4\pm 18.3$	$40.8\pm 13.6$	0.23
Lung V (%)	20	$6.1\pm 1.8$	$3.3\pm 1.4$	0.02
Lung V (%)	10	$2.5\pm 1.2$	$0.9\pm 1.1$	0.02
Contralateral kidney mean dose (Gy)	12	$3.6\pm 1.2$	$3.8\pm 1.8$	0.47
Contralateral kidney V (%)	20	0	0	‐
Ipsilateral kidney mean dose (Gy)	12	$12.4\pm 6.1$	$11.9\pm 6.8$	0.25
Ipsilateral kidney ${\mathrm{V}}_{15}(\%)$	20	$28.2\pm 18.6$	$31.5\pm 20.0$	0.06
Spinal cord Dmax (Gy)	50	$43.0\pm 3.2$	$44.1\pm 4.0$	0.42
Liver mean dose (Gy)	24	$14.8\pm 6.4$	$14.6\pm 7.9$	0.19

^aSignificance ($p<0.05$)

${\mathrm{V}}_{\mathrm{x}}(\%)=\text{volume receiving}\ge \mathrm{X}\%\text{of prescribed dose}$; ${\mathrm{D}}_{\mathrm{x}}(\%)=\text{dose received by X}\%\text{of volume}$.