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. Author manuscript; available in PMC: 2016 Mar 1.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2015 Jan 10;91(3):564–570. doi: 10.1016/j.ijrobp.2014.10.054

Table 2.

Comparison of hippocampal dosimetry between the treating physician’s contours and the Principal Investigators’ contour. EQD2 : equivalent dose in 2-Gy fractions assuming an α/β ratio of 2.0.

Mean (Range) Hippocampal contour used to
evaluate IMRT plan		 p value
Credentialing
physician		 Gold standard
Hippocampal maximum dose (Gy) 14.9 (10.6–17.0) 20.3 (12.3–32.2) <0.001
% of cases with hippocampal maximum dose >17Gy 0% 69%
Hippocampal D100% (Gy) 8.6 (6.3–10.0) 8.6 (6.3–10.0) NS
% of cases with hippocampal D100% >10 Gy 0% 0%
Hippocampal D40% (Gy) 10.7 (7.3–13.3) 11.0 (7.4–15.4) <0.001
% of cases with hippocampal D40% >7.3 Gy (EQD2) 77.5% 77.5%