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Normal and abnormal findings on τ-PET images. (a) Axial 18F-AV-1451 τ-PET image obtained at the convexities shows minimal radiotracer uptake. Additional imaging throughout the brain (not shown) did not show significant focal uptake at any location. (b) Axial τ-PET image of a patient with cognitive impairment shows discrete abnormal radiotracer accumulation (arrow) in the right parietal lobe.
