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As exciting as such advances are, brain imaging is still primarily a research tool when it comes to mental disorders. Scans are appropriate for ruling out obvious pathology, like brain tumors, as possible causes of symptoms. The differences in brain structure and activity seen in disorders like schizophrenia or ADHD, for example, are typically only meaningful when comparing group statistics. There is simply too much individual variation in brain structure and function for an individual's scan to be diagnostic or predictive, given the current state of the science.

Also: http://www.eurekalert.org/pub_releases/2012-04/bawh-dxl040912.php