Phase aberration effects on beam shape evaluated with particle motion in an elastic phantom

Sara Aristizabal, Carolina Amador, James F. Greenleaf, Matthew W. Urban

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

Abstract

The phase aberration phenomenon reduces spatial resolution and image contrast of the shear wave-based elasticity images impeding the study and determination of tissue mechanical properties. Shear waves can be used to make measurements of tissue elasticity. These shear waves can be produced by focused ultrasound 'push' beams that generate acoustic radiation force and displace the tissue. We investigated the effects of phase aberration on the push beam shape evaluated with particle motion. A Verasonics ultrasound system equipped with a linear array transducer operating at different center frequencies (f 0) was used to perform these experiments. Porcine belly skin, subcutaneous fat, and muscle were separated and placed on top of the elastic phantom. A beam of 300 μs duration focused at a depth of 40 mm from the transducer produced particle motion in the direction of the beam. The beam shape without the tissue layers was determined using a thresholding operation to create a mask from which the particle velocity for each pixel was estimated and used for further calculations. The median particle velocity decreased as various layers were added on the top of the elastic phantom. Moreover, changes in f0 also affected the particle velocity amplitude.

Original languageEnglish (US)
Title of host publication2013 IEEE International Ultrasonics Symposium, IUS 2013
Pages2006-2009
Number of pages4
DOIs
StatePublished - Dec 1 2013
Event2013 IEEE International Ultrasonics Symposium, IUS 2013 - Prague, Czech Republic
Duration: Jul 21 2013Jul 25 2013

Publication series

NameIEEE International Ultrasonics Symposium, IUS
ISSN (Print)1948-5719
ISSN (Electronic)1948-5727

Other

Other2013 IEEE International Ultrasonics Symposium, IUS 2013
CountryCzech Republic
CityPrague
Period7/21/137/25/13

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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    Aristizabal, S., Amador, C., Greenleaf, J. F., & Urban, M. W. (2013). Phase aberration effects on beam shape evaluated with particle motion in an elastic phantom. In 2013 IEEE International Ultrasonics Symposium, IUS 2013 (pp. 2006-2009). [6725192] (IEEE International Ultrasonics Symposium, IUS). https://doi.org/10.1109/ULTSYM.2013.0512