Monday, February 14, 2011

Ultrasound beam lets scientists see deep into human tissue | KurzweilAI

Ultrasound beam lets scientists see deep into human tissue | KurzweilAI: Wang’s guide star is an ultrasound beam that “tags” light that passes through it. When it emerges from the tissue, the tagged light, together with a reference beam, creates a hologram.

When a “reading beam” is then shown back through the hologram, it acts as a time-reversal mirror, creating light waves that follow their own paths backward through the tissue, coming to a focus at their virtual source, the spot where the ultrasound is focused.

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