Each year, millions of Americans visit an emergency room to be evaluated for a brain injury.  Most of them undergo a CT scan.  Far too many leave without a proper diagnosis. KCBS’s Jeff Bell talked with a U.C. San Francisco researcher who’s working to change that.

<p>Each year, millions of Americans visit an emergency room to be evaluated for a brain injury.&nbsp;&nbsp;Most of them undergo a CT scan. &nbsp;Far too many leave without a proper diagnosis. KCBS&rsquo;s Jeff Bell talked with a U.C. San Francisco researcher who&rsquo;s working to change that.</p>

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