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Published March 23, 2010 | Published
Journal Article Open

Transverse flow imaging based on photoacoustic Doppler bandwidth broadening


We propose a new method to measure transverse flow velocity based on photoacoustic Doppler bandwidth broadening, which is determined by the geometry of the probe-beam and the velocity of the transverse flow. By exploiting pulsed laser excitation and raster motor scanning, three-dimensional structure and flow velocity can be imaged simultaneously. In addition, the flow direction can be determined with bidirectional scanning. In a flowing suspension of red-dyed microspheres (diameter: 6μm), transverse flow speeds ranging from 0 to 2.5mm/s as well as flow direction were measured. A cross-sectional flow image was also obtained with the tube laid in a zigzag pattern.

Additional Information

© 2010 SPIE. Paper 09355SSR received Aug. 13, 2009; revised manuscript received Dec. 10, 2009; accepted for publication Dec. 17, 2009; published online Mar. 23, 2010. We thank Konstantin Maslov, Christopher Favazza, Song Hu, and Arie Krumholz for helpful discussion. This research was supported by the National Institutes of Health Grants No. R01 EB000712, No. R01 NS46214, No. R01 EB008085, and No. U54 CA136398. L.W. has a financial interest in Microphotoacoustics, Inc. and Endra, Inc., which, however, did not support this work.

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