New York Times: Once a cure for Alzheimer’s has been found and tested, doctors will need a way to identify patients who can benefit from the cure before brain damage becomes too severe. Gina Kolata of the New York Times reports on a promising new technique for early Alzheimer’s diagnosis. The technique relies on standard positron emission tomography. What’s new is the development of a radioactive tracer that reliably binds to the amyloid plaques in the brains of Alzheimer’s patients.