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Published December 24, 2007 | Published
Journal Article Open

Photoacoustic Doppler flow measurement in optically scattering media


We recently observed the photoacoustic Doppler effect from flowing small light-absorbing particles. Here, we apply the effect to measure blood-mimicking fluid flow in an optically scattering medium. The light scattering in the medium decreases the amplitude of the photoacoustic Doppler signal but does not affect either the magnitude or the directional discrimination of the photoacoustic Doppler shift. This technology may hold promise for a new Doppler method for measuring blood flow in microcirculation with high sensitivity.

Additional Information

© 2007 American Institute of Physics. Received 30 October 2007; accepted 28 November 2007; published online 28 December 2007. We acknowledge the support provided by National Institutes of Health under Grant Nos. R01 EB000712 and R01 NS046214.

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