Improved Wall Shear Rate Method for Robust Measurements

S. Ricci, A. Swillens, A. Ramalli, Magnus Cinthio, P. Segers, P. Tortoli

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

6 Citations (SciVal)


The Wall Shear Rate (WSR) represents an important parameter correlated with cardiovascular diseases, like, for example the atherosclerotic plaque formation. The WSR can be obtained as the radial blood velocity gradient assessed in the wall proximity. The WSR is typically approximated by using flow models like Poiseuille and/or Womersley applied to the measured center-line velocity. However these models cannot account for the complex flow configurations generated by the real geometry of the vessel, and the WSR estimate is inaccurate. The direct measurement of the velocity gradient through a Doppler high-resolution multigate technique can achieve a better accuracy, but the signal near the wall is affected by clutter. In this work an improved velocity reconstruction method for WSR measurement is proposed. It is based on the measurement of the actual velocity profile and a two-step interpolation that reconstructs the velocity in the wall proximity. The method, verified through realistic multiphysics simulations of a carotid artery, achieves a 5% RMS error for velocity reconstruction and a -10.5% underestimation in WSR assessment. The method was also tested on 14 healthy volunteers.
Original languageEnglish
Title of host publication2014 IEEE International Ultrasonics Symposium (IUS)
PublisherIEEE - Institute of Electrical and Electronics Engineers Inc.
Publication statusPublished - 2014
EventIEEE International Ultrasonics Symposium (IUS), 2014 - Chicago, IL, United States
Duration: 2014 Sep 32014 Sep 6


ConferenceIEEE International Ultrasonics Symposium (IUS), 2014
Country/TerritoryUnited States
CityChicago, IL

Subject classification (UKÄ)

  • Medical Engineering


  • Wall Shear Rate
  • Multiphysics Simulations
  • Blood Velocity Profile


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