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. Author manuscript; available in PMC: 2012 Apr 1.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2010 Dec 22;79(5):1302–1309. doi: 10.1016/j.ijrobp.2010.10.052

Table 3.

Split-Dose Spinal Cord Tolerance

Field Arrangement ED50 (Gy)
4 mm + 4 mm with 8 mm separation(27) 45.4 (40–50)*
4 mm + 4 mm with 12 mm separation(27) 41.6 (38–46)*
4 mm single field(29) 53.7 (49–62)*
8 mm single field(28, 29) 24.9 (22–29)*
*

95% confidence interval