Relative perfusion map (top) vs transit time map (bottom) in a healthy control (left) and patient with SCA (right). Posterior region in healthy control demonstrates longer transit time. Right left perfusion asymmetry in SCA patient is not observed in corresponding transit map.

Univariate analysis of sex vs tissue TT (left). Males demonstrate shorter transit time than females. After correcting for gender there is an observed inverse flow effect where larger CBF corresponds to shortened tissue TT (right).