Comparison of laser-induced and classical ultrasound

Joel J Niederhauser; Michael Jaeger; Martin Frenz

doi:10.1117/12.483509

1 July 2003 Comparision of laser-induced and classical ultasound

Joel J Niederhauser, Michael Jaeger, Martin Frenz

Proceedings Volume 4960, Biomedical Optoacoustics IV; (2003) https://doi.org/10.1117/12.483509
Event: Biomedical Optics, 2003, San Jose, CA, United States

Abstract

A classical medical ultrasound system was combined with a pulsed laser source to allow laser-induced ultrasound imaging (optoacoustics). Classical ultrasound is based on reflection and scattering of an incident acoustic pulse at internal tissue structures. Laser-induced ultrasound is generated in situ by heating optical absorbing structures, such as blood vessels, with a 5 ns laser pulse (few degrees or fraction of degree), which generates pressure transients. Laser-induced ultrasound probes optical properties and therefore provides much higher contrast and complementary information compared to classical ultrasound. An ultrasound array transducer in combination with a commercial medical imaging system was used to record acoustic transients of both methods. Veins and arteries in a human forearm were identified in vivo using classical color doppler and oxygenation dependent optical absorption at 660 nm and 1064 nm laser wavelength. Safety limits of both methods were explored. Laser-induced ultrasound seems well suited to improve classical ultrasound imaging of subcutaneous regions.

Citation Download Citation

Joel J Niederhauser, Michael Jaeger, and Martin Frenz "Comparision of laser-induced and classical ultasound", Proc. SPIE 4960, Biomedical Optoacoustics IV, (1 July 2003); https://doi.org/10.1117/12.483509

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