Small calcification indicator in ultrasonography using correlation of echoes with a modified Wiener filter

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

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Purpose: The purpose of this study is to improve the calcification depiction ability in ultrasonography using correlation of echoes with a modified Wiener filter. Methods: The waveform of an ultrasound pulse changes when it passes through the location of a calcification. Since the change in echo waveform caused by a calcification decreases the correlation of waveforms in adjacent scan lines, we have proposed a calcification depiction method using the decorrelation of echoes. However, the low signal-to-noise ratio of echoes also decreases the correlation of the echoes. In this study, we employ the correlation of echoes with a modified Wiener filter to suppress the effect of noise, as an indicator of a calcification. Results: The proposed calcification indicator depicted copper cylindrical rods 0.2 mm in size at a depth of 2 cm with a sensitivity of 80% and a positive predictive value of 80%, despite being hardly depicted at all on B-mode ultrasound imaging. Conclusion: This study suggests the potential of the proposed method to improve the performance of calcification depiction by ultrasound devices.

Original languageEnglish
Pages (from-to)127-135
Number of pages9
JournalJournal of Medical Ultrasonics
Volume39
Issue number3
DOIs
Publication statusPublished - 2012 Jul 1

Keywords

  • Calcification
  • Calcification depiction
  • Decorrelation
  • Ultrasonography
  • Wiener filter

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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