Figure 2. Images of a representative patient (male, 78 years old, lesion volume: 41.5 ml, time from stroke onset to MRI: 24 h, National Institutes of Health Stroke Scale on admission: 13, day-90 modified Rankin Scale: 3) with acute stroke in the r.

T₂ weighted fluid attenuated inversion recovery imaging (A) showed a slightly hyperintense signal in the lesion. No obvious abnormal signal was found in T₁ weighted imaging (B). (C) was a diffusion image (b value = 1,000 s/mm²) of intravoxel incoherent motion-diffusion weighted imaging, and it demonstrated the infarct lesion with apparent abnormal high signal. 3D time-of-flight magnetic resonance angiography (D) showed that the distal branches of the middle cerebral artery in the lesion area were more sparse than those on the contralateral area. Compared with the normal brain tissue, the infarct lesion in this case showed significantly lower signal on apparent diffusion coefficient (E), true diffusion coefficient (F) and perfusion fraction (H) maps, as well as slightly lower signal on pseudo-diffusion coefficient (G) map.