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This is Scientific American 60-Second Health. I'm Wayt Gibbs. Got a minute?

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When a person suffers a stroke quick treatment is crucial.

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But there are two very different kinds of strokes:

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some result from blood clots that block circulation within the brain,

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others are caused by ruptured vessels that spill blood into surrounding tissue.

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The use of clot-busting drugs when a hemorrhage is happening can cause additional injury or death.

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So doctors lose precious time waiting for stroke victims to get MRIs or CAT scans before they start treatment.

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But soon EMT's might be able to quickly tell whether patients have a blockage or a bleed by having them wear a high-tech helmet.

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Researchers at Chalmers University of Technology in Gothenburg, Sweden developed the prototype helmet and tested it on 45 stroke patients.

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The gadget covers the head with a patchwork of antennas.

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As each antenna beams low-intensity microwaves through the head in sequence, the other antennas detect how the waves scatter.

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Any pooling blood from a hemorrhage causes deflections easily spotted on an attached computer.

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The research is in the IEEE Transactions on Biomedical Engineering.

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Trials using mobile stroke helmets in ambulances are scheduled to start in the fall.

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As with proper treatment, the sooner the better.

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Thanks for the minute, for Scientific American 60-Second Health.I'm Wayt Gibbs.

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