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FIG 2. 41-year-old male control subject.
A, Axial T2-weighted image (3540/105) of the midbrain barely depicts the substantia nigra (arrow). The red nucleus (arrowhead) is depicted as a round area of low intensity resulting from the accumulation of iron.
B, Diffusion-weighted image with a left-right direction diffusion-sensitizing gradient shows a distinct crescent of low signal intensity (arrow) between the cerebral peduncle and the tegmentum. Large arrowhead indicates substantia nigra; small arrowhead, mammillary body.
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