Evaluation of shear wave dispersion in hepatic viscoelastic models including fibrous structure

Shiori Fujii, Makoto Yamakawa, Kengo Kondo, Takeshi Namita, Tsuyoshi Shiina

研究成果: Article査読

9 被引用数 (Scopus)

抄録

In diagnosis of chronic hepatitis, shear wave elastography is utilized for the evaluation of fibrosis progression by estimating the viscoelasticity from shear wave speeds. The dispersion slope method is studied to evaluate the viscosity and fibrosis stage. However, when the shear wave length is a little larger than the size of fibrous structure in liver fibrosis tissues, shear wave propagates repeating reflection or refraction and influences the dispersion slope. We simulate shear wave propagation in a model with a fibrous structure and compare the dispersion slope with a homogeneous model in order to investigate the effect of the fibrous structure. As a result, the dispersion slope is dependent on the viscosity in a high frequency range but affected by the fibrous structure in a low frequency range. Results show that the fibrous structure influences contents of low frequencies. Using different frequency ranges to estimate the dispersion slope can help more precise viscoelasticity analysis.

本文言語English
論文番号SGGE07
ジャーナルJapanese Journal of Applied Physics
58
SG
DOI
出版ステータスPublished - 2019
外部発表はい

ASJC Scopus subject areas

  • 工学(全般)
  • 物理学および天文学(全般)

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