Simultaneous imaging of tissue motion and flow velocity using 2Dphase-coupled speckle tracking

Yayun Wan, Dalong Liu, Emad S. Ebbini

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

We introduce a new method for simultaneous imaging of tissue motion andflow with subsample accuracy in both axial and lateral directions. The methodutilizes a phase-coupled 2D speckle tracking approach, which employs the true 2Dcomplex cross correlation to find subpixel displacements in both axial andlateral directions. We have also modified the imaging sequence on a Sonix RPscanner to allow high frame rate 2D data collection in a limited field of viewcovering the region of interest (M2D-mode). Together with the robust 2D speckletracking method, M2D imaging allows for capturing the full dynamics of the flowand wall/tissue motion, even when the flow is primarily in the lateral direction(with respect to the imaging beam). The fine vector displacement estimates inboth axial and lateral directions are shown to allow for smooth and contiguousstrain and shear strain calculations with minimal filtering. The quality of thedisplacement and strain fields is demonstrated by experimental results from aflow phantom (ATS Model 524) and in vivo images of the carotid artery in ahealthy volunteer. The results clearly demonstrate the feasibility ofsimultaneous imaging of the vector flow field and the wall/tissue motion and thecorresponding strains at high spatial and temporal sampling. This may providean essential tool in modeling the fluid-solid interactions between the blood andblood vessel, a key challenge in vascular biomechanics.

Original languageEnglish (US)
Title of host publication2010 IEEE International Ultrasonics Symposium, IUS 2010
Pages487-490
Number of pages4
DOIs
StatePublished - Dec 1 2010
Event2010 IEEE International Ultrasonics Symposium, IUS 2010 - San Diego, CA, United States
Duration: Oct 11 2010Oct 14 2010

Publication series

NameProceedings - IEEE Ultrasonics Symposium
ISSN (Print)1051-0117

Other

Other2010 IEEE International Ultrasonics Symposium, IUS 2010
CountryUnited States
CitySan Diego, CA
Period10/11/1010/14/10

Keywords

  • 2D speckle tracking
  • Motion detection
  • flow channels
  • tissue mechanics

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