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ROI placements in supraventricular levels on ASL and SPECT. We drew the ROIs in the bilateral anterior cerebral artery territories and anterior and posterior MCA territories in TCF (A), ATT (B), baseline SPECT (C), and acetazolamide challenge SPECT (D). We also drew an ROI in the ipsilateral cerebellum with the highest uptake on visual assessment for normalization of SPECT values.
