. Author manuscript; available in PMC: 2020 Nov 15.

Published in final edited form as: Int J Radiat Oncol Biol Phys. 2019 Aug 10;105(4):773–783. doi: 10.1016/j.ijrobp.2019.08.003

Table 2.

Mean dose and imaging parameter by region

Structure	Sample Size^* (N)	Mean Dose (mean Gy, SD)	Percent Change in Volume (mean %, SD) / Number Atrophied (%)	Percent Change in MD (mean %, SD)	Percent Change in FA (mean %, SD)

Left hippocampus	18	13.8 (13.7)	−2 (17) / 9 (50)	-	-

Right hippocampus	19	19.3 (18.0)	+4 (28) / 10 (53)	-	-

Left WM
Entorhinal	19	20.4 (20.9)	-	17 (8)	−16 (23)
Parahippocampal	19	22.6 (23.2)	-	−5 (8)	6 (27)
Temporal pole	18	24.8 (20.0)	-	15 (8)	−10 (5)

Right WM
Entorhinal	18	23.8 (18.9)	-	19 (10)	−16 (15)
Parahippocampal	19	24.5 (22.2)	-	−8 (10)	11 (11)
Temporal pole	19	24.8 (20.0)	-	16 (7)	−31 (15)

The analytic sample size is less than the total eligible sample size of 22 subjects due to censoring.

Percent change is shown from baseline to 6 months (i.e. a negative value represents a decrease over time). Abbreviations: SD, standard deviation; WM, white matter; Gy, Grey; FA, fractional anisotropy; MD, mean diffusivity.