[OPTICAL REVIEW Vol. 21, No. 4 (2014) 461-467]
© 2014 The Japan Society of Applied Physics
Power Spectrum and Blood Flow Velocity Images Obtained by Dual-Beam Backscatter Laser Doppler Velocimetry
Hiroki ISHIDA1, Youichi YASUE2, Tadashi HACHIGA1, Tsugunobu ANDOH3, Shunsuke AKIGUCHI1, Yasushi KURAISHI3, and Tadamichi SHIMIZU3
1Toyama National College of Technology, Imizu, Toyama 933-0293, Japan
2Nippon Marine Enterprises Ltd., Yokosuka, Kanagawa 238-0004, Japan
3Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama 930-0194, Japan
(Received July 2, 2013; Accepted April 7, 2014)
We developed a micro multipoint laser Doppler velocimeter (μ-MLDV) for noninvasive in-vivo measurements of blood flow and we presented the results of demonstrations performed on experimental animals. In this paper, we investigate the validity of power spectrum analysis for determining the flow velocity and the minimum power of the semiconductor laser in the μ-MLDV. Although average velocity is generally estimated from a peak position (fpeak) in the power spectrum, the power spectrum of blood flow included an additional component in the high-frequency region. The conventional method for determining the average velocity of flows of transparent artificial fluids, which involves determining the average velocity from fpeak, is unsuitable for in-vivo measurements of blood flow. The laser power was reduced from 140 to 30 mW since 30 mW was the minimum power at which images of blood flow velocity in microvessels could be obtained. About 30 mW (power density of 15 mW/mm2) is the maximum power which can be irradiated to humans. Further reduction in the laser power is necessary before this technique can be applied to humans.
Key words: laser Doppler velocimeter, in-vivo measurements, blood flow, microvessels