Table 3.

The dosimetric comparisons of OARs for DA‐VMAT and 7F‐IMRT plans.

Variables of OARs	Weight	$Q{I}_{7F}^{DA}$
QI of serial organs
Brain stem	0.15	$0.96\pm 0.04$
Spinal cord	0.15	$1.03\pm 0.03$
Lt eye	0.075	$0.98\pm 0.14$
Rt eye	0.075	$0.98\pm 0.08$
Lt lens	0.075	$0.99\pm 0.10$
Rt lens	0.075	$1.02\pm 0.17$
Mandible	0.075	$0.97\pm 0.02$
Chiasm	0.1	$0.95\pm 0.09$
QI of parallel organs
Lt parotid gland	0.075	$0.97\pm 0.04$
Rt parotid gland	0.075	$0.94\pm 0.05$
Oral cavity	0.075	$1.05\pm 0.10$
CQI of eleven OARs		$0.98\pm 0.02$

Abbreviations: IMRT: intensity‐modulated radiotherapy; 7F: 7‐field fixed‐beam IMRT; DA‐VMAT: dual arcs with the SmartArc technique; QI: quality index; Lt: left side; Rt: right side; CQI: comprehensive quality index; OAR: organ at risk; $Q{I}_{7F}^{DA}$: QI of DA‐VMAT vs. 7F‐IMRT; numbers in fields were shown in the format of $mean\pm \text{standard}\hspace{0.17em}\text{deviation}$.