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FIG 2. Initial native CT scans and corresponding time-to-peak parameter maps. The maps are color-coded with values ranging from 5 to 40 seconds.
A, Patient 6: 62-year-old woman who presented 40 minutes after onset of left hemiparesis. The CT scan is normal. Note the clear demarcation of the diseased area in the right hemisphere, corresponding to the right ACA and MCA territories, including the basal ganglia on the parameter map.
B, Patient 17: 77-year-old woman who presented 40 minutes after onset of somnolence and left hemiparesis. The native CT scan is normal. The parameter map shows an area of delayed perfusion in the territory of the right MCA.
C, Patient 1: 60-year-old man who had a normal CT scan 2.8 hours after onset. The time-to-peak map depicts a large perfusion deficit in the left MCA territory, including the basal ganglia.
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