How the Technique Works (IMAGE)

California Institute of Technology

How the Technique Works

Caption

Left: Light enters the tissue sample and is scattered (blue arrows). From above, ultrasound is focused into a small area inside the tissue. The ultrasound shifts the frequency of any light that passed through that area ever so slightly, changing its color. The color-shifted light (green) is then recorded. Right: The recorded light is sent back to retrace its steps to the small region where the ultrasound was focused -- which means the light itself is focused on that area.

Credit

Caltech/Ying Min Wang and Benjamin Judkewitz

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