The Purpose of Functional Mapping in Focal Cerebral Ischemia.- Positron Emission Tomography Versus Nuclear Magnetic Resonance Imaging?.- Aims on Phosphorus-31 Magnetic Resonance Imaging.- In Vivo Nuclear Magnetic Resonance Imaging of Sodium-23 in the Human Head.- Uncoupling of Flow and Metabolism in Infarcted Tissue.- Remote Effects of Focal Lesions on Cerebral Flow and Metabolism.- Focal Flow Disturbances in Acute Strokes: Effects on Regional Metabolism and Tissue pH.- Measurement of Cerebral Protein Synthesis and Intracellular pH in Man by Positron Emission Tomography.