Correlation artifacts in speed of sound estimation in scattering media

J. Ophir, W. Johnson, Y. Yazdi, D. Shattuck, D. Mehta

Research output: Contribution to journalArticle

Abstract

A recently described method for speed of sound estimation in tissues in pulse-echo mode involves reception of echoes generated by an ultrasonic pulse by means of a linearly tracking transducer. When the peaks of echo amplitudes are used as markers of arrival time, stairstep-like artifacts appear in the echo arrival time vs. transducer position plots. We postulate that these artifacts area consequence of the speckle phenomenon commonly encountered in ultrasonic imaging. To test this hypothesis, we report computer simulations and water tank experiments which demonstrate similarities between the behavior of the stairsteps and the properties of ultrasonic speckle. Additionally, equations describing the precision of the speed of sound estimation in terms of the second order statistical properties of the stairstep artifact are derived.

Original languageEnglish (US)
Pages (from-to)341-353
Number of pages13
JournalUltrasound in Medicine and Biology
Volume15
Issue number4
DOIs
StatePublished - 1989
Externally publishedYes

Keywords

  • Artifact
  • Beam Tracking
  • Correlation
  • Estimation
  • Pulse echo
  • Scattering
  • Speckle
  • Speed of sound

ASJC Scopus subject areas

  • Biophysics
  • Radiological and Ultrasound Technology
  • Acoustics and Ultrasonics

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