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FIG 2. This graph shows the relationship between log of the ratio of the ADC value in CVI compared with normal brain and symptom duration. A log plot was performed as data appeared to show an exponential relationship with time. Subjects scanned within 2 days of symptom onset show a reduction in ADC within CVI, suggesting cytotoxic edema. By 4 to 6 days, CVI shows a similar ADC to that of normal brain. By 11 days, ADC is higher in CVI than in normal brain, suggesting vasogenic edema. The numbers adjacent to each point indicate the subject identification (see Table). Follow-up results are available for subject 8 (open square symbol). Subjects who underwent a single study are identified by a closed black circle. Error bars indicate the SD of signal intensity.FIG 3. This graph shows the relationship between percent T2 signal change and symptom duration. For each subject, the T2 signal within CVI has been compared with normal brain and the percent change in T2 signal calculated. Signal intensity of CVI appears to peak around day 2. The numbers adjacent to each point indicate the subject identification (Table). Follow-up results are available for subject 8 (open square symbol). Subjects who underwent a single study are indicated by a closed black circle. Error bars indicate the SD of signal intensity
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