A New Ultrasonic Imaging System by Using a Rotating Random Phase Disk and Power Spectral and Third Order Correlation Analysis

  • Takuso Sato
  • Shusou Wadaka
  • Junichi Ishii
  • Tadasu Sunada

Abstract

A new ultrasonic imaging system which uses neither scanning of a receiver nor beam forming by a phased array is presented. The fundamental idea is the transformation of the spatial distribution of wave intensity, which is the object to be reconstructed as the image, into temporal information by using a rotating random phase disk placed just behind the object and the analyses of the signal detected by a fixed receiver placed far from the disk. It is shown that the power spectrum of the signal is the shadow of the object on the plane which includes the point detector and the plane parallel to the object plane. Moreover if the 3rd order correlation function of the signal is calculated, this value gives directly the required reconstructed image of the object, provided that a point source is placed near the obj ect. A complete system with random phase disk made of acryl and operating at 3 MHz with FFT algorithm of a mini-computer is constructed. The theoretical discussions by using spectral representation of the wave field and resolution analyses as well as reconstructed images are presented. Although most of the results have been submitted as papers in JASA, Refs. 1 and 2, comprehensive discussions are given in this article.

Keywords

Wave Field Ultrasonic Wave Random Phase Object Plane Power Spectrum Analysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    T. Sato, S. Wadaka and J. Ishii, “A New Ultrasonic Imaging System by Using a Moving Random Phase Mask and a Stationary Point Receiver”, submitted to J. Acoust. Soc. Am Google Scholar
  2. 2.
    S. Wadaka and T. Sato, “An Ultrasonic Imaging System by Using a Moving Asymmetric Random Phase Mask and 3rd Order Correlation Function Analysis”, submitted to J. Acoust. Soc. Am. Google Scholar
  3. 3.
    Acoustic Imaging edited by G. Wade (Plenum, New York and London, 1976), Ch. 2, 3, 5 and ‘l1.Google Scholar
  4. 4.
    ibid., Ch. 2, 3, 7, 8 and 11.Google Scholar
  5. 5.
    Our paper to be submitted to J. Acoust. Soc. Am. Google Scholar
  6. 6.
    L. E. Estes and R. Boucher, J. Opt. Soc. Am 65, 760 (1975).Google Scholar

Copyright information

© Springer Science+Business Media New York 1977

Authors and Affiliations

  • Takuso Sato
    • 1
  • Shusou Wadaka
    • 1
  • Junichi Ishii
    • 1
  • Tadasu Sunada
    • 1
  1. 1.Faculty of Science and EngineeringTokyo institute of TechnologyNagatsuda, Midori-Ku, Yokohama 227Japan

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