Imaging transverse flow velocity using spectral bandwidth of the Doppler frequency shift in phase-resolved ODT

Hongwu Ren; Zhongping Chen; Kjell Morten Brecke; Zhihua Ding; Yonghua Zhao; J. Stuart Nelson M.D.

doi:10.1117/12.491304

14 June 2002 Imaging transverse flow velocity using spectral bandwidth of the Doppler frequency shift in phase-resolved ODT

Hongwu Ren, Zhongping Chen, Kjell Morten Brecke, Zhihua Ding, Yonghua Zhao, J. Stuart Nelson M.D.

Author Affiliations +

Proceedings Volume 4619, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications VI; (2002) https://doi.org/10.1117/12.491304
Event: International Symposium on Biomedical Optics, 2002, San Jose, CA, United States

Abstract

The Doppler bandwidth extracted from the standard deviation of the frequency shift in phase-resolved optical Doppler tomography (ODT) is used to image the velocity component transverse to the probing beam. Using a simple geometric optics model, the linear dependence of the Doppler bandwidth on flow velocity is theoretically derived and it is found that the effective numerical aperture (NA) of the optical objective determines the slope of this dependence. Above a certain threshold flow velocity, this linear relationship is in good agreement with experimental data. In the case where the angle between the probing beam and flow direction is within –15 degree to the perpendicular, the Doppler frequency shift is very sensitive to angle position while the Doppler bandwidth is insensitive to flow direction. Linear dependence of the flow velocity on the Doppler bandwidth allows accurate measurement of flow velocity without precise determination of flow direction. In addition, it also extends the dynamic range of the average frequency shift mapping method used in the phase-resolved ODT.

Citation Download Citation

Hongwu Ren, Zhongping Chen, Kjell Morten Brecke, Zhihua Ding, Yonghua Zhao, and J. Stuart Nelson M.D. "Imaging transverse flow velocity using spectral bandwidth of the Doppler frequency shift in phase-resolved ODT", Proc. SPIE 4619, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications VI, (14 June 2002); https://doi.org/10.1117/12.491304

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KEYWORDS

Doppler effect

Doppler tomography

Geometrical optics

Velocity measurements

Signal detection

Biomedical optics

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