Image formation in vibro-acoustography with sector array transducers

Glauber T. Silva, Alejandro C. Frery, Eliana Almeida, Shigao Chen, Mostafa Fatemi, James F. Greenleaf

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

1 Scopus citations

Abstract

This paper presents the image formation process in vibro-acoustography for systems based on sector array transducers. These transducers are an alternative to annular concave transducers. They represent an innovative technique deserving detailed assessment in vibro-acoustography applications. The system point-spread function (PSF) is defined in terms of the acoustic emission of a point-target in response to the dynamic ultrasound radiation force. This force is produced by two overlapping ultrasound beams. We calculate the radiation force on the target in a nonviscous fluid using the plane wave approximation for the ultrasound beams. The beamforming of sector array transducers is analyzed through linear acoustics. An expression for the velocity potential produced by sector arrays is derived, and the vibro-acoustography PSF is evaluated numerically. An experimental setup is design to validate the theory; the comparison is made using location and amplitude of sidelobes and spatial resolution defined by the PSF. Results show that the computed PSF is in full agreement with the PSF obtained experimentally.

Original languageEnglish (US)
Title of host publicationProceedings - XVII Brazilian Symposium on Computer Graphics and Image Processing
EditorsA.A. Araujo, J.L.D. Comba, I. Navazo, A.A. Souza
Pages25-32
Number of pages8
DOIs
StatePublished - Dec 1 2004
EventProceedings - XVII Brazilian Symposium on Computer Graphics and Image Processing, SIBGRAPI 2004. And II Ibero-American Symposium on Computer Graphics, SIACG 2004 - Curitiba, Brazil
Duration: Oct 17 2004Oct 20 2004

Publication series

NameBrazilian Symposium of Computer Graphic and Image Processing
ISSN (Print)1530-1834

Other

OtherProceedings - XVII Brazilian Symposium on Computer Graphics and Image Processing, SIBGRAPI 2004. And II Ibero-American Symposium on Computer Graphics, SIACG 2004
CountryBrazil
CityCuritiba
Period10/17/0410/20/04

    Fingerprint

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Silva, G. T., Frery, A. C., Almeida, E., Chen, S., Fatemi, M., & Greenleaf, J. F. (2004). Image formation in vibro-acoustography with sector array transducers. In A. A. Araujo, J. L. D. Comba, I. Navazo, & A. A. Souza (Eds.), Proceedings - XVII Brazilian Symposium on Computer Graphics and Image Processing (pp. 25-32). (Brazilian Symposium of Computer Graphic and Image Processing). https://doi.org/10.1109/SIBGRA.2004.1352939