Nonuniform Phase Distribution in Ultrasound Speckle Analysis—Part I: Background and Experimental Demonstration

Li Weng, John M. Reid, P. M. Shankar, Kawan Soetanto, Xuan Ming Lu

Research output: Contribution to journalArticle

24 Citations (Scopus)


In some cases, the statistical properties of the phase of ultrasound speckle in B-scan images differ from the uniform distribution characteristic exhibited by the fully developed speckle. This phenomenon has been noted when examining scattering structures with a somewhat regular spacing using wideband pulse excitation. It is shown by computer simulation and experiments on phantoms that when the mean scatterer spacing is equal to multiples of a half wavelength at the reference frequency of the receiver quadrature demodulator, the center of the echo phase distribution, plotted on the complex plane, will shift away from the origin. When the spacing is equal to an odd multiple of a quarter wavelength, the phase distribution will have a figure “8” shape. By noticing these noncircular phase distributions while changing the demodulation frequency, the mean scatterer spacing can be estimated.

Original languageEnglish
Pages (from-to)352-359
Number of pages8
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Issue number3
Publication statusPublished - 1992 May


ASJC Scopus subject areas

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering

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