Comparison of simultaneous arterial spin labeling MRI and ¹⁵O-H₂O PET measurements of regional cerebral blood flow in rest and altered perfusion states.

Intersubject and intrasubject variability for 15 O-H 2 O PET and ASL MRI gCBF measurements is also shown in Table 1 . Overall, a highly significant positive correlation of ASL MRI with 15 O-H 2 O PET across all states was observed in the measurements of global and gray and white matter perfusion ( Table 2 , Figure 1 and Supplementary Material S5).

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