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Fig. 5D. —32-year-old woman with onset of left arm and face weakness 6 hr before scanning. Tissue time—attenuation curves. Iodinated contrast material is slower to enter (thin arrow) and slower to wash out (thick arrow) of right middle cerebral artery territory compared with normal left middle cerebral artery territory. Inspection of such curves is not usually done in clinical situation. Instead, computer algorithm computes tissue values pixel by pixel to create perfusion maps such as those in B.

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