Liver fibrosis structure effects on viscoelasticity estimation using group shear wave speeds

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

Viscoelasticity measurements can improve the accuracy of liver fibrosis diagnosis for chronic hepatitis. Methods to estimate tissue viscoelasticity using frequency characteristics of the shear wave phase velocity are common but not robust. Therefore, in recent years, a technique to estimate viscoelasticity from group speeds in displacement and particle velocity has been proposed as a robust method [1]. However, we earlier reported that the liver fibrotic structure can change the frequency characteristics of phase velocity [2]. Therefore, in this study, we evaluated the influence of the liver fibrosis structure on the estimation method using group shear wave speeds. We used the previously developed liver fibrosis progression model to investigate the effect of the fibrous structure. Shear wave propagation was simulated using this model. Viscoelasticity was estimated using lookup tables that represented the relation between group speeds in displacement and particle velocity and viscoelasticity. When a shear wave reflection component is present, a directional filter is required. The directional filter affects the group speeds of the shear wave. Therefore, we established lookup tables considering the characteristics of the directional filter. Using these tables, we performed viscoelasticity estimations on liver fibrosis models and corresponding uniform models. In the uniform models, the viscoelasticity was estimated correctly. However, in the liver fibrosis models, the Young's modulus was estimated to be smaller than the actual value, and the shear viscosity coefficient was estimated to be greater than the actual value with the difference from the actual value increasing as fibrosis progressed.

本文言語English
ホスト出版物のタイトル2019 IEEE International Ultrasonics Symposium, IUS 2019
出版社IEEE Computer Society
ページ419-422
ページ数4
ISBN(電子版)9781728145969
DOI
出版ステータスPublished - 2019 10月
外部発表はい
イベント2019 IEEE International Ultrasonics Symposium, IUS 2019 - Glasgow, United Kingdom
継続期間: 2019 10月 62019 10月 9

出版物シリーズ

名前IEEE International Ultrasonics Symposium, IUS
2019-October
ISSN(印刷版)1948-5719
ISSN(電子版)1948-5727

Conference

Conference2019 IEEE International Ultrasonics Symposium, IUS 2019
国/地域United Kingdom
CityGlasgow
Period19/10/619/10/9

ASJC Scopus subject areas

  • 音響学および超音波学

フィンガープリント

「Liver fibrosis structure effects on viscoelasticity estimation using group shear wave speeds」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル