Improving imaging of cancerous tissues by reversing time

A novel time-reversal technology is being applied by researchers that allows them to better focus light in tissue, such as muscles and organs. Current high-resolution optical imaging technology allows researchers to see about 1 millimeter deep into the body. In an attempt to improve this "visibility," this study used photoacoustic imaging, which combines light with acoustic waves, or sound, to form a sharper image, even several centimeters into the skin.