Figure 6.
Heterogeneity of DWI and PWI lesion structure. (A) Examples of the three-dimensional structure of DWI and PWI lesions in acute stroke patients. Left, a single PWI lesion; center, a DWI lesion with multiple individual lesion components; right, a PWI lesion with multiple components. (B) Three-dimensional imaging of DWI and PWI lesions in acute stroke patients reveals intertwined regions of mismatch, DWI/PWI overlap, and early reperfusion. Regions that contain DWI lesions without superimposed PWI lesions (early reperfusion) are shown in blue; areas where DWI lesions have superimposed PWI lesions are shown in purple. The red areas are PWI lesions without superimposed DWI lesions (regions of mismatch). Reprinted from Stroke with permission from Olivot et al (2009). DWI, diffusion-weighted imaging; PWI, perfusion-weighted imaging.