Table 1.

OAR dose constraints used for lung SBRT model for 12 Gy/fx plan in either 3 or 4 fractions

Organ	Volume	Volume Max.	Max. Point Dose (Gy) a
Spinal Cord	$<0.35$ cc	20.8 Gy	26 Gy
		(5.2 Gy/fx)	(6.5 Gy/fx)
	$<1.2$ cc	13.6 Gy
		(3.4 Gy/fx)
Esophagus	$<5$ cc	18.8 Gy	30 Gy
		(4.7 Gy/fx)	(7.5 Gy/fx)
Heart	$<15$ cc	28 Gy	34 Gy
		(7 Gy/fx)	(8.5 Gy/fx)
Total Lung ‐ PTV	$<10\%$	20 Gy	NA
Ribs			$<105\%$ Rx
Brachial Plexus	$<3$ cc	23.6 Gy	27.2 Gy
		(5.9 Gy/fx)	(6.8 Gy/fx)
Stomach	$<10$ cc	17.6 Gy	27.2 Gy
		(4.4 Gy/fx)	(6.8 Gy/fx)
Trachea	$<4$ cc	15.6 Gy	34.8 Gy
		(3.9 Gy/fx)	(8.7 Gy/fx)
Skin	$<10$ cc	33.2 Gy	36 Gy
		(8.3 Gy/fx)	(9 Gy/fx)

^aMaximum point dose defined as 0.035 cc.