Portable brain scanner with Bluetooth for emergency stroke assessment is not a dream anymore, and is in fact being developed for use by EMT's and other paramedical professionals. Faster, cheaper evaluation of strokes in patients is the goal of Dr Alistair McEwan and his EIT unit. And no radiation to the patient.
"Electrical impedance tomography (EIT), (also called applied potential tomography) is an imaging technique that uses an electrical current applied to the body by a set of electrodes and measuring the voltage developed between another set of electrodes. EIT is about a thousand times cheaper and a thousand times smaller than X-ray and positron emission tomography, but has lower resolution and more variability between subjects. "
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