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Non-Invasive Measurement of Shear Rates of Pulsating Pipe Flow Using Echo PIV

에코 PIV를 이용한 맥동 유동에서의 in vitro 전단률 측정 연구

  • 김형범 (경상대학교 기계항공공학부) ;
  • 정인영 (경상대학교 전기전자공학부)
  • Published : 2004.12.01

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. This study shows the utility of combining ultrasound contrast imaging with particle image velocimetry (PIV) for non-invasive measurement of velocity vectors. 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. These studies indicate that echo PIV is a promising technique for the non-invasive measurement of velocity profiles and shear stress.

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