High resolution medical acoustic vascular imaging using frequency domain interferometry

Hirofumi Taki, Tomoki Kimura, Takuya Sakamoto, Toru Sato

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Frequency domain interferometry (FDI) for medical acoustic vascular imaging was employed to detect multiple targets with high range resolution. The phase of each frequency component of an echo varies with the frequency, allowing target intervals to be estimated from the phase variance. When the interference within a range gate is coherent, the cross correlation between the desired signal and the coherent interference signal is nonzero. In this case the desired signal is canceled by a coherent interference signal. Therefore, we utilized frequency averaging to suppress the correlation of the coherent interference. The results of computational simulations using a pseudo echo signal showed that Capon method combined with a frequency averaging technique using a single reference wave presents a higher range resolution than that using a conventional method. In our experimental study, the range resolution of FDI combined with Capon method using a single reference wave was severely deteriorated as we approximated the autocorrelation function to the cross-correlation function of the echo and the reference signal. Ultimately, FDI combined with Capon method using multiple optimized reference waves gave a high range resolution than that using a single reference wave and could distinguish two target boundaries that were 0.05 mm apart.

Original languageEnglish
Title of host publicationProceedings of the 9th IASTED International Conference on Visualization, Imaging, and Image Processing, VIIP 2009
Pages7-12
Number of pages6
Publication statusPublished - 2009 Dec 1
Event9th IASTED International Conference on Visualization, Imaging, and Image Processing, VIIP 2009 - Cambridge, United Kingdom
Duration: 2009 Jul 132009 Jul 15

Publication series

NameProceedings of the 9th IASTED International Conference on Visualization, Imaging, and Image Processing, VIIP 2009

Other

Other9th IASTED International Conference on Visualization, Imaging, and Image Processing, VIIP 2009
CountryUnited Kingdom
CityCambridge
Period09/7/1309/7/15

Keywords

  • Capon
  • Coherent interferences
  • Frequency averaging
  • Frequency domain interferometry
  • Medical acoustic imaging
  • Vascular imaging

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition
  • Software

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