Table 1.

The dose constrains and the relative priority used during optimization for multiple partial VMAT planning.

Structures	Criteria	Dose Limit (% of Rx dose)/(Gy)	Priority (Level 1–3)	Priority (Level 4–5)
PTV	$V_{95}$	$>95\%$ of Rx	120	400
Maximum dose	0%	$>110\%$	250	450
Heart	Mean dose	9Gy	120	120
	$V_5$	<70%
	$V_{10}$	<30%
	$V_{25}$	<5%
	$V_{30}$	$<2.5\%$
Left Lung	Mean dose	10Gy	80–250	80–250
	$V_5$	<45%
	$V_{10}$	<30%
	$V_{20}$	<15%
Right Lung	Mean dose	4Gy
	$V_5$	<20%	120–250	120–250
	$V_{10}$	$<0.5\%$
TLV	Mean dose	6.5Gy
	$V_5$	<25%	none	none
	$V_{20}$	<10%
Right Breast	Mean dose	2.5Gy	120–250	120–250
	Maximum dose	10Gy
	$V_5$	<5%
	$V_{10}$	$<0.5\%$

Rx: prescription; TLV: total lung volume