Positron emission tomography (PET) with three different radiotracers can now measure amyloid plaques, tau tangles and metabolic activity in the brains of living Alzheimer’s patients. This multimodal study shows significant correlation between increased tau and decreased metabolic activity in the brain—a clear sign of neurodegeneration—reveal researchers at the 2016 Annual Meeting of the Society of Nuclear Medicine and Molecular Imaging (SNMMI). {read more here}