This work introduces a method for the in vivo measurement and analysis of turbulence within the leakage of a mechanical heart valve. Several analysis techniques were applied to ultrasound measurements acquired within the atrium of a pig, and error associated with these techniques was analyzed. The technique chosen applies cyclic averaging to mean and maximum velocity measurements within small, normalized phase windows to calculate Reynolds normal stresses in the direction of the ultrasound beam. Maximum shear stresses are estimated from these normal stresses using an analytical technique. The stresses observed were smaller than those reported from previous in vitro simulations.
An In Vivo Method for Measuring Turbulence in Mechanical Prosthesis Leakage Jets
Contributed by the Bioengineering Division for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received by the Bioengineering Division September 5, 2002; revision received October 1, 2003. Associate Editor: C. R. Ethier.
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Travis, B. R., Christensen, T. D., Smerup, M., Olsen, M. S., Hasenkam, J. M., and Nygaard, H. (March 9, 2004). "An In Vivo Method for Measuring Turbulence in Mechanical Prosthesis Leakage Jets ." ASME. J Biomech Eng. February 2004; 126(1): 26–35. https://doi.org/10.1115/1.1644563
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