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FIG 2. Trace image of hyperacute infarct in an 89-year-old woman scanned 6 hours after developing right-sided weakness and aphasia.
A, Diffusion-weighted image (b = 1000 s/mm2) demonstrates a high-signal area consistent with acute infarct in the left basal ganglia and posterior limb of the internal capsule.
B, Diffusion-weighted image (b = 2500 s/mm2) demonstrates the increased contrast of the high-signal lesion.
C, Diffusion-weighted image (b = 3000 s/mm2) also demonstrates this lesion more clearly than at b = 1000; anisotropic effects are evident in the posterior periventricular regions.
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