Brain Blood Flow May Tell of Concussion Recovery

Why not use something like this for stroke? Rather than your doctor pulling a recovery diagnostic out of thin air?
http://www.medpagetoday.com/Neurology/HeadTrauma/50286?xid=nl_mpt_DHE_2015-03-04&
In a cohort study of college football players, there was evidence of cerebral blood flow recovery in the right insular and superior temporal cortex both cross-sectionally and longitudinally for those who'd had a concussion, Timothy Meier, PhD, of The Mind Research Network in Albuquerque, N.M., and colleagues reported online in JAMA Neurology.

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Importantly, they said, cerebral blood flow was diminished in the dorsal midinsular cortex a month after concussion in athletes who were slower to recover, and it was inversely related to the magnitude of initial psychiatric symptoms.
The findings "suggest regional cerebral blood flow may provide an objective biomarker for tracking both normal and potentially pathological recovery from concussion," Meier and colleagues wrote.

More at link.