Pathophysiological topography of acute ischemia by combined diffusion- weighted and perfusion MRI

Abstract

Background and Purpose - Combined echoplanar MRI diffusion-weighted imaging (DWI), perfusion imaging (PI), and magnetic resonance angiography (MRA) can be used to visualize acute brain ischemia and predict lesion evolution and functional outcome. The appearance of a larger lesion by PI than by DWI quantitatively defines a mismatch of potential clinical importance. Qualitative lesion variations exist in the topographic concordance of this mismatch. We examined both the topographic heterogeneity and relative frequency of mismatched patterns in acute stroke using these MRI techniques. Methods - Acute DWI, PI, and MRA studies of 34 prospectively recruited patients with supratentorial ischemic le..