FIG 3. 90-year-old woman with acute right hemiparesis and aphasia 2 hours before imaging.
A, CT perfusion CBV map shows well-circumscribed area of very low CBV (arrows).
B, MR perfusion CBV map. Correlation of volume of MR-CBV abnormality with area of CT-CBV abnormality approached statistical significance in our study.
C, CT perfusion CBF map shows a larger abnormality than seen on the CBV map. CBF in the range of 0–10 mL/100 g/min is displayed as blue (arrows).
D, MR perfusion CBF map with areas of low relative CBF (< 50%) displayed as blue (arrows). Good correlation was found in our study between extents of 2D CT-CBF abnormality and 3D MR-CBF abnormality.
E, CT perfusion MTT map shows the largest extent of abnormality. Values of MTT greater than 6 seconds are displayed as red (arrows).
F, MR MTT map. Good correlation was found in our study between 2D CT-MTT abnormalities and 3D MR-MTT abnormalities (arrows).
G, Diffusion-weighted MR image (b = 1000 s/mm2) obtained 4 hours after symptom onset through the basal ganglia shows abnormality in the left frontal lobe (arrows). Good correlation was found in our study between extent of CT-CBV abnormality and extent of diffusion-weighted abnormality. Good correlation was also found with extents of MR-CBV and MR-MTT abnormalities.