Comparison of shift estimation strategies in spectral elastography

Kenneth Hoyt, Flemming Forsberg, Jonathan Ophir

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

This paper compares the performance of various spectral shift estimators for use in spectral elastography, namely, the normalized cross-correlation (NCC), sum squared difference (SSD) and sum absolute difference (SAD). Simulation and experimental results demonstrate that the spectral SSD-based elastographic method exhibits no marked difference in performance compared to the more computationally costly NCC-based approach, which has conventionally been the preferred estimator in spectral elastography. The spectral SAD-based strain estimator, despite being computationally less burdening, failed to exhibit performance comparable to that of the NCC- and SSD-based techniques. Furthermore, though spectral subsample estimation techniques using a cosine-fit interpolation method outperformed that of the parabolic-fit method in terms of both reduced bias errors and standard deviations, the latter was analyzed in this study due to computational simplicity. The role of spectral density was evaluated without and with parabolic-based subsample interpolation. Based on minimizing computational complexity, it is concluded that a (low density) spectral SSD strain estimator coupled with parabolic-based subsample estimation is the preferred choice for spectral elastography.

Original languageEnglish (US)
Pages (from-to)99-108
Number of pages10
JournalUltrasonics
Volume44
Issue number1
DOIs
StatePublished - Jan 1 2006

Keywords

  • Elasticity imaging
  • Spectral elastography
  • Strain Filter
  • Subsample estimation
  • Ultrasound imaging

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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