Based on the 26th Annual Scientific Conference of the Biological Engineering Society, this book brings together specialists' discussions of recent developments in techniques for studying the cerebral circulation and their application to clinical problems. Its contents reflect the pre-eminence of radioactive tracer methods for tissue perfusion measurements and Doppler ultrasound for non-invasive assessment of major blood vessels, and highlight new developments of great promise within both of these fields. These findings have a direct impact on a vital area of medical practice. Because even a temporary interruption of blood supply to parts of the brain can have disastrous consequences, the measurement of blood flow and early detection of disease in the supply of vessels are key concerns to clinicians and scientists.