Air-coupled acoustic radiation force for non-contact generation of broadband mechanical waves in soft media

Łukasz Ambroziński, Ivan Pelivanov, Shaozhen Song, Soon Joon Yoon, David Li, Liang Gao, Tueng T. Shen, Ruikang K. Wang, Matthew O'Donnell

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Abstract

A non-contact method for efficient, non-invasive excitation of mechanical waves in soft media is proposed, in which we focus an ultrasound (US) signal through air onto the surface of a medium under study. The US wave reflected from the air/medium interface provides radiation force to the medium surface that launches a transient mechanical wave in the transverse (lateral) direction. The type of mechanical wave is determined by boundary conditions. To prove this concept, a home-made 1 MHz piezo-ceramic transducer with a matching layer to air sends a chirped US signal centered at 1 MHz to a 1.6 mm thick gelatin phantom mimicking soft biological tissue. A phase-sensitive (PhS)-optical coherence tomography system is used to track/image the mechanical wave. The reconstructed transient displacement of the mechanical wave in space and time demonstrates highly efficient generation, thus offering great promise for non-contact, non-invasive characterization of soft media, in general, and for elasticity measurements in delicate soft tissues and organs in bio-medicine, in particular.

Original languageEnglish (US)
Article number043701
JournalApplied Physics Letters
Volume109
Issue number4
DOIs
StatePublished - Jul 25 2016

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Ambroziński, Ł., Pelivanov, I., Song, S., Yoon, S. J., Li, D., Gao, L., Shen, T. T., Wang, R. K., & O'Donnell, M. (2016). Air-coupled acoustic radiation force for non-contact generation of broadband mechanical waves in soft media. Applied Physics Letters, 109(4), [043701]. https://doi.org/10.1063/1.4959827