An anatomical atlas of the three regions (medial, dorsal, and ventrolateral) of the substantia nigra pars compacta (SNpc) were created based on neuromelanin (NM)-sensitive images, and Proton density, T1, and T2 values for each region were characterized in healthy volunteers. The T1 value of the ventrolateral group was higher than the other SNpc regions, which may be correlated with the NM concentration. The measured relaxation times can be used as baseline values for the SNpc.
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