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Phys Rev Lett. 2007 Nov 2;99(18):184501. Epub 2007 Oct 29.

Photoacoustic Doppler effect from flowing small light-absorbing particles.

Author information

  • 1Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Dr., St. Louis, Missouri 63130, USA.

Abstract

From the flow of a suspension of micrometer-scale carbon particles, the photoacoustic Doppler shift is observed. As predicted theoretically, the observed Doppler shift equals half of that in Doppler ultrasound and does not depend on the direction of laser illumination. This new physical phenomenon provides a basis for developing photoacoustic Doppler flowmetry, which can potentially be used for detecting fluid flow in optically scattering media and especially low-speed blood flow of relatively deep microcirculation in biological tissue.

PMID:
17995411
[PubMed - indexed for MEDLINE]
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