Table 1.

Average radiation doses to the major white matter structures defined by ICBM DTI-81 atlas (n=51).

White matter structure	Dose in CGE (coefficient of variation)		Surgical defects†
	R	L	R	L
cerebral peduncle	49.9 (0.13)	49.9 (0.12)*
corticospinal tract	45.8 (0.18)	46.8 (0.18)
fornix	42.1 (0.24)		4
pontine crossing tract	39.1 (0.36)
anterior limb of internal capsule	38.6 (0.19)	38.2 (0.18)	1
posterior limb of internal capsule	37.9 (0.23)	37.9 (0.24)	2
inferior fronto-occipital fasciculus	27.7 (0.37)	26.9 (0.40)
superior fronto-occipital fasciculus	26.0 (0.33)*	26.0 (0.32)	2
genu of corpus callosum	25.5 (0.49)		4
rostral body of corpus callosum	25.2 (0.45)*		12
external capsule	23.8 (0.31)	24.5 (0.33)	1
cingulum (hippocampus)	23.0 (0.57)	23.1 (0.59)*
anterior midbody of corpus callosum	22.8 (0.39)*		10
medial lemniscus	22.7 (0.78)*	22.4 (0.79)*
superior cerebellar peduncle	17.6 (0.74)	18.6 (0.73)
posterior midbody of corpus callosum	17.9 (0.51)*		1
anterior corona radiata	16.2 (0.65)	15.8 (0.66)	5	1
superior corona radiata	15.4 (0.50)	15.7 (0.46)	8	1
middle cerebellar peduncle	14.9 (0.61)
fornix/stria terminalis	13.3 (0.88)	15.3 (0.84)*
cingulum (cingulate gyrus)	12.7 (0.55)*	13.2 (0.53)	3	1
isthmus of corpus callosum	12.3 (0.86)*
retrolenticular part of internal capsule	8.2 (1.10)*	9.3 (1.16)
inferior cerebellar peduncle	7.3 (1.76)*	7.2 (1.86)*
sagittal stratum	5.1 (1.25)	6.7 (1.46)
splenium of corpus callosum	5.8 (1.50)*
superior longitudinal fasciculus	5.3 (0.83)	6.0 (0.97)*	1
posterior corona radiata	3.7 (1.70)	5.1 (1.45)*
uncinate fasciculus	1.8 (3.16)*	2.7 (2.49)
posterior thalamic radiation	0.9 (3.78)*	1.9 (2.72)*

Abbreviations: CGE=cobalt gray equivalent; R=right; L=left.

^*Structures showing significant radiation dose effect.

^†The number of patients presenting surgical corridors or catheter tracks.