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FIG 4. Each column in this figure indicates the ratio (mean across all patients) of two lesion sizes. CBF lesion volumes are given at the threshold of 75%. The first and second columns (black) give the ratios CBF1 to ADC1 and CBF1 to T23. The CBF lesion at first examination is smaller than the ADC lesion at the same time point (P < .006, paired t test) as well as the final T2 lesion (P < .001, paired t test) as indicated by the ratio below unity. The third and fourth column (blue) give the ratios of the CBF lesion at the second time point to the ADC lesion at the same time point as well to the final T2 lesion. The ratio below unity indicates that the CBF lesion in the subacute phase is smaller than the ADC lesion at the same time point and the final T2 lesion (P < .001, P < .003, paired t test).
