Figure 5 Diffusion-weighted (DWI) and perfusion-weighted (PWI) images from MRI are useful in selecting patients for cerebrovascular intervention therapies and monitoring their outcome. Here, a patient with a large region of hypoperfusion in the distribution of the middle cerebral artery already has some evidence of tissue ischemia as demonstrated by the white areas that border the ventricle in the prethrombolysis DW image (top left). Following thrombolysis (bottom row), note that perfusion has been reestablished to the area of the middle cerebral artery and the patient is left with only a small ischemia injury on the posterior border of the lateral ventricle (courtesy of Chelsea Kidwell, Jeffrey Saver, and Jeffrey Alger, UCLA School of Medicine).

4. Metabolism

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