Photoacoustic imaging is a cutting-edge technology that uses light and sound to create images of the inside of the body. When a pulsed laser illuminates the surface of biological tissue, part of the photon energy is absorbed by the tissue to generate heat. The increase of the heat causes thermoelastic expansion of the tissue, releasing energy in the form of ultrasonic waves. By scanning the sample and collecting the corresponding photoacoustic signals, researchers are able reconstruct 2D or 3D images of the biological tissue.
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Source: Phys.org