Hand-held gadget to scan the body

Hand-held gadgets could be used in the future to take 3D scans showing tissues inside the body, US scientists say.

The magnetic resonance imaging (MRI) scanners currently used for this job in hospitals are large and expensive.

But Princeton University is looking for ways to make scanners cheaper and smaller without affecting performance.

The breakthrough is down to a new way of detecting magnetic signals from water, its researchers told New Scientist magazine.

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