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Cerebral blood flow (CBF) measurements are of high clinical value and can be acquired non-invasively with no radiation exposure using pseudo-continuous arterial spin labeling (ASL). The aim of this study was to evaluate accordance in resting state CBF between ASL (CBF ASL ) and 15 O-water positron emission tomography (PET) (CBF PET ) acquired simultaneously on an integrated 3T PET/MR system. The data comprised ASL and dynamic 15 O-water PET data with arterial blood sampling of eighteen subjects (eight patients with focal epilepsy and ten healthy controls, age 21 to 61 years). 15 O-water PET parametric CBF images were generated using a basis function implementation of the single tissue compartment model. Cortical and subcortical regions were automatically segmented using Freesurfer. Average CBF ASL and CBF PET in grey matter were 60 ± 20 and 75 ± 22 mL/100 g/min respectively, with a relatively high correlation ( r = 0.78, p &lt; 0.001). Bland-Altman analysis revealed poor agreement (bias = -15 mL/100 g/min, lower and upper limits of agreements = -16 and 45 mL/100 g/min, respectively) with a negative relationship. Accounting for the negative relationship, the width of the limits of agreement could be narrowed from 61 mL/100 g/min to 35 mL/100 g/min using regression-based limits of agreements. Although a high correlation between CBF ASL and CBF PET was found, the agreement in absolute CBF values was not sufficient for ASL to be used interchangeably with 15 O-water PET.

Evaluation of Arterial Spin Labeling MRI—Comparison with 15O-Water PET on an Integrated PET/MR Scanner