Fast strain tensor imaging using beam steered plane wave ultrasoundtransmissions

H.H.G. Hansen, R.G.P. Lopata, T. Idzenga, C.L. de Korte

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

10 Citations (Scopus)
1 Downloads (Pure)

Abstract

Ultrasound strain imaging can be used to assess local mechanical propertiesof tissue. From conventional non-steered 2D ultrasound data, the axial (alongthe beam) displacements and strains can be estimated precisely, whereas lateral(perpendicular to the ultrasound beam) displacements and corresponding strainsare more complicated to estimate. The lateral displacements/strains can beestimated more precisely by adding data from acquisitions at various large beamsteering angles, although frame rates are reduced. Plane wave ultrasoundtransmission enables ultrasound acquisition at high frame rates. This studyinvestigates beam steered plane wave ultrasound transmission for full straintensor estimation at high frame rates. Using finite element modeling (FEM) andField II, ultrasound radio frequency data of a vessel with a vulnerable plaquewere generated before and after the vessel underwent an intraluminal pressureincrease of 4 mmHg. RF data were simulated for a linear array transducer (3-11MHz, fs = 39 MHz, pitch = 135 μm) that either transmitted focused pulses orplane waves at beam steering angles of 30°, 0° and 30°. In receivedynamic focusing was applied. Band limited noise was added to obtain asignal-to-noise ratio of 20 dB. Displacements were iteratively estimated using2D cross-correlation. Next, principal strains were derived using 1D leastsquares strain estimators. The absolute differences between the estimatedprincipal strains and the FEM principal strains were determined to compare thetransmission methods. It was found that plane wave beam steering enabled a fastand more precise estimation (Wilcoxon, P>0.001) of the full strain tensorthan conventional 0° strain imaging. Although focused beam steering providedslightly more precise estimates, the main advantage of the plane wave approachis that it suffers less from motion artifacts when imaging tissue in vivo, dueto its at least 50 times higher frame rate.

Original languageEnglish
Title of host publication2010 IEEE International Ultrasonics Symposium, IUS 2010
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Pages1344-1347
Number of pages4
ISBN (Print)9781457703829
DOIs
Publication statusPublished - 1 Dec 2010
Event2010 IEEE International Ultrasonics Symposium, IUS 2010 - San Diego, CA, United States
Duration: 11 Oct 201014 Oct 2010

Conference

Conference2010 IEEE International Ultrasonics Symposium, IUS 2010
Abbreviated titleIUS 2010
Country/TerritoryUnited States
CitySan Diego, CA
Period11/10/1014/10/10

Keywords

  • beam-steering
  • plane waves
  • strain imaging
  • vascularultrasound
  • vulnerable plaque

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