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T2*-weighted gradient-echo single shot echo-planar transverse image (800/47; flip angle, 60 degrees), obtained at the level of the sylvian fissures in patient 7 (Table 1), who had left carotid occlusion, shows AIF selection at the M1 and M2 segments of the MCA. Pixels chosen for AIF determination are illustrated in yellow. Ten to 12 pixels were chosen in the MCA, both for an AIF ipsilateral to the occlusion and an AIF contralateral to the occlusion.
