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Noninvasive Measurement of Steady and Pulsating Velocity Profiles and Shear Rates in Arteries Using Echo PIV: In Vitro Validation Studies

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Abstract

Although accurate measurement of velocity profiles, multiple velocity vectors, and shear stress in arteries is important, there is still no easy method to obtain such information in vivo. We report on the utility of combining ultrasound contrast imaging with particle image velocimetry (PIV) for noninvasive measurement of velocity vectors. This method (echo PIV) takes advantage of the strong backscatter characteristics of small gas-filled microbubbles (contrast) seeded into the flow. The method was tested in vitro. The steady flow analytical solution and optical PIV measurements (for pulsatile flow) were used for comparison. When compared to the analytical solution, both echo PIV and optical PIV resolved the steady velocity profile well. Error in shear rate as measured by echo PIV (8%) was comparable to the error of optical PIV (6.5%). In pulsatile flow, echo PIV velocity profiles agreed well with optical PIV profiles. Echo PIV followed the general profile of pulsatile shear stress across the artery but underestimated wall shear at certain time points. However, error in shear from echo PIV was an order of magnitude less than error from current shear measurement methods. These studies indicate that echo PIV is a promising technique for noninvasive measurement of velocity profiles and shear stress.

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Authors and Affiliations

  1. School of Mechanical and Aerospace Engineering, Gyeongsang National University, Korea

    Hyoung-Bum Kim

  2. Department of Mechanical Engineering, University of Colorado, Boulder, CO

    Jean Hertzberg & Robin Shandas

  3. Department of Pediatrics, Section of Cardiology, The Children's Hospital, University of Colorado Health Sciences Center, Denver, CO

    Craig Lanning & Robin Shandas

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  1. Hyoung-Bum Kim
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  2. Jean Hertzberg
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  4. Robin Shandas
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Kim, HB., Hertzberg, J., Lanning, C. et al. Noninvasive Measurement of Steady and Pulsating Velocity Profiles and Shear Rates in Arteries Using Echo PIV: In Vitro Validation Studies. Annals of Biomedical Engineering 32, 1067–1076 (2004). https://doi.org/10.1114/B:ABME.0000036643.45452.6d

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  • DOI: https://doi.org/10.1114/B:ABME.0000036643.45452.6d

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