Special Section on Photons Plus Ultrasound: Imaging and Sensing

Transverse flow imaging based on photoacoustic Doppler bandwidth broadening

[+] Author Affiliations
Junjie Yao, Lihong V. Wang

Washington University in St. Louis, Department of Biomedical Engineering, Optical Imaging Laboratory, Campus Box 1097, One Brookings Drive, St. Louis, Missouri 63130

J. Biomed. Opt. 15(2), 021304 (March 23, 2010). doi:10.1117/1.3339953
History: Received August 13, 2009; Revised December 10, 2009; Accepted December 17, 2009; Published March 23, 2010; Online March 23, 2010
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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 0to2.5mms as well as flow direction were measured. A cross-sectional flow image was also obtained with the tube laid in a zigzag pattern.

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© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Junjie Yao and Lihong V. Wang
"Transverse flow imaging based on photoacoustic Doppler bandwidth broadening", J. Biomed. Opt. 15(2), 021304 (March 23, 2010). ; http://dx.doi.org/10.1117/1.3339953


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