. Author manuscript; available in PMC: 2017 Jan 2.

Published in final edited form as: Radiother Oncol. 2016 Jan 2;118(1):99–104. doi: 10.1016/j.radonc.2015.12.018

Table 2.

Fractionation scheme and treatment planning rectal dose constraints

Fractionation Level	I	II	III
Dose per Fraction (Gy)	2.94	3.63	4.3
Number of Fractions	22	16	12
Total Dose (Gy)	64.7	58.1	51.6
Tumor EQD₂ (α/β 1.5) (Gy)	82.6	85.1	85.5
Late Normal Tissue EQD₂ (α/β 3.0) (Gy)	76.8	77.0	75.3
Dose (Gy)	Rectal Percent Limits (%)
30	–	–	40
35	–	38	–
40	37	32	27
50	25	19	12
55	–	12	–
60	13.5	–	–