Calculus detection for ultrasonography using decorrelation of forward scattered wave

Hirofumi Taki, Takuya Sakamoto, Makoto Yamakawa, Tsuyoshi Shiina, Toru Sato

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Purpose The purpose of this paper is to propose a novel strategy to detect small calculi efficiently. Methods The proposed calculus detection strategy focuses on decorrelation of forward scattered waves caused by the failure of Born's approximation. A calculus causes waveform changes of transmit pulses, resulting in a decrease in the cross-correlation coefficients calculated from IQ signals scattered near the calculus position. Therefore, we can detect calculi from the appearance of dips in correlation coefficients. Results When a calculus exists in a digital tissue map, sharp and deep dips in cross-correlation coefficients between acoustic IQ signals appear around the calculus. By contrast, no apparent dip exists when a tissue map contains no calculus. A scan line interval of 0.2 mm or less is appropriate for the conditions simulated in this paper, and the proper transmit focal range for the proposed method is at a calculus range. Conclusion These results imply that the proposed strategy can improve the efficiency of US devices for small calculus detection.

Original languageEnglish
Pages (from-to)129-135
Number of pages7
JournalJournal of Medical Ultrasonics
Volume37
Issue number3
DOIs
Publication statusPublished - 2010 Jul 1

Keywords

  • CFAR
  • Calculus detection
  • Decorrelation
  • Forward scattered wave
  • Ultrasonography

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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