In many ways, Alzheimer's disease is the biological version of a
slow-motion train wreck. The disease process begins years before
symptoms are evident.
There is no cure, and current treatments alleviate symptoms
temporarily at best.
As they evaluate new drug therapies, researchers are using
various brain imaging techniques to better identify the patients
who are most likely to benefit from treatment -- those at the
earliest stages of the Alzheimer's disease process. In this slide
show, we show what these brain scans look like and what
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