Table 1.

Mean values of longitudinal relaxation rate (R₁), effective transverse relaxation rate ($R_{\mathrm{2}}^{\mathrm{*}}$), and volume magnetic susceptibility difference (Δχ) with respect to normal appearing white matter over six subjects and both brain hemispheres for selected anatomical regions.

Region	Structure	R1 (s−1)	$R_{\mathrm{2}}^{\mathrm{*}}$(s−1)	Δχ (ppb)
Midbrain	Red nucleus	0.809 ± 0.029	61.3 ± 6	84 ± 8
	Substantia nigra	0.759 ± 0.031	69.4 ± 3	82 ± 13
	Crus cerebri	0.777 ± 0.029	29.8 ± 3	−27 ± 18
Pons	Reticulotegmental nucleus	0.704 ± 0.043	34.5 ± 3	−6 ± 12
	Corticospinal tract	0.684 ± 0.042	27.1 ± 4	25 ± 19
	Transverse pontine fibers	0.723 ± 0.036	36.0 ± 5	−24 ± 19
	Pontocerebellar tract	0.693 ± 0.033	38.3 ± 2	−26 ± 16
CSF	Cerebrospinal fluid	0.300 ± 0.006	0.9 ± 0.4	−6 ± 11

The values are presented as mean ± standard deviation.