Hypo-perfusion was observed among APOE ε4 carriers in both white and gray matter from the previous study in cognitively normal and mild cognitive impairment groups. Diffusion tensor imaging metrics in the white matter was further examined in the hypo-perfusion region and compared with perfusion metrics. Multiple statistical trends match with the observations from the perfusion metrics, which may suggest evidence of that a perfusion abnormality among APOE ε4 carriers may precedes the disruption of white matter integrity in the group.
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