Table 1.

Suggested constraints

	8 Gy in 1 fraction	20 Gy in 5 fractions
aSpinal Cord	Max dose < 110% of 8 Gy	Max dose < 110% of 20 Gy
Lungs (excl. GTV)	V6 Gy < 35%	V12 Gy < 35%
	Mean dose < 6 Gy	Mean dose < 12 Gy
Kidney (each)	V6 Gy < 30%	V12 < 30%
	Mean dose < 5 Gy	Mean dose < 10 Gy
bSmall Bowel	Max dose < 110% of 8 Gy	Max dose < 110% of 20 Gy

^a spinal cord to L2, spinal cord PRV is 0.5 cm margin around the spinal cord

^b small bowel contoured by RO or RT depending on institutional polices