Imaging Alzheimer's disease.

Prior reviews on the topic of imaging and Alzheimer's disease have focused predominately on the technical features of imaging modalities or have summarized the results of epidemiologic studies. As brain scientists and brain practitioners, our main focus should be on the neurobiologic correlates of imaging, so we can intertwine this knowledge with our understanding of disease pathophysiology. A focus on these two features--the neurobiologic correlates of imaging and the pathophysiology of Alzheimer's disease--has provided the organizing principle of this review.