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Proceedings Paper

Imaging transverse flow velocity using spectral bandwidth of the Doppler frequency shift in phase-resolved ODT
Author(s): Hongwu Ren; Zhongping Chen; Kjell Morten Brecke; Zhihua Ding; Yonghua Zhao; J. Stuart Nelson M.D.
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Paper 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.

Paper Details

Date Published: 14 June 2002
PDF: 8 pages
Proc. SPIE 4619, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications VI, (14 June 2002); doi: 10.1117/12.491304
Show Author Affiliations
Hongwu Ren, Beckman Laser Institute and Medical Clinic and Univ. of California/Irvine (United States)
Zhongping Chen, Beckman Laser Institute and Medical Clinic and Univ. of California/Irvine (United States)
Kjell Morten Brecke, Beckman Laser Institute and Medical Clinic and Univ. of California/Irvine (United States)
Zhihua Ding, Beckman Laser Institute and Medical Clinic and Univ. of California/Irvine (United States)
Yonghua Zhao, Beckman Laser Institute and Medical Clinic and Univ. of California/Irvine (United States)
J. Stuart Nelson M.D., Beckman Laser Institute and Medical Clinic and Univ. of California/Irvine (United States)


Published in SPIE Proceedings Vol. 4619:
Coherence Domain Optical Methods in Biomedical Science and Clinical Applications VI
Valery V. Tuchin; Joseph A. Izatt; James G. Fujimoto, Editor(s)

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