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Correlation between age and different resting CBF measures. (a)MRI gray matter (GM) cerebral perfusion and GM transit time and (b)TCD MCAv and CVCi. Black lines denote lines of best fit with Spearman's r and associated p values. *Represents significant effect (p ≤ .05). Abbreviations: CVCi, cerebrovascular conductance; GM, gray matter; MRI, magnetic resonance imaging; MCAv, middle cerebral artery blood velocity; TCD, transcranial Doppler
