Validation of viscoelastic and nonlinear liver model for needle insertion from in vivo experiments

Yo Kobayashi, Akinori Onishi, Takeharu Hoshi, Kazuya Kawamura, Makoto Hashizume, Masakatsu G. Fujie

研究成果: Conference contribution

2 被引用数 (Scopus)

抄録

This paper shows the viscoelastic and nonlinear liver model for organ model based needle insertion, in which the deformation of an organ is estimated and predicted, and the needle trajectory is decided with organ deformation taken into consideration. An organ model including detailed material characteristics is important in order to achieve the proposed method. Firstly, the material properties of the liver are modeled from the measured data and its viscoelastic characteristics are represented by differential equations, including the term of the fractional derivative. Nonlinearity in terms of the stiffness was measured, and modeled using the quadratic function of strain. Next, a solution of an FE(Finite element) model using such material properties is shown. We use the sampling time scaling property as the solution for the viscoelastic system, while the solution for a nonlinear system using the Euler method and the Modified Newton-Raphson method is also shown. Finally, the deformation of liver model is calculated and pig liver of in vivo situation is obtained from medical ultrasound equipment. Comparing the relationship between needle displacement and force on real liver and liver model, we validate the proposed model.

本文言語English
ホスト出版物のタイトルLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
ページ50-59
ページ数10
5128 LNCS
DOI
出版ステータスPublished - 2008
イベント4th International Workshop on Medical Imaging and Augmented Reality, MIAR 2008 - Tokyo
継続期間: 2008 8 12008 8 2

出版物シリーズ

名前Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
5128 LNCS
ISSN(印刷版)03029743
ISSN(電子版)16113349

Other

Other4th International Workshop on Medical Imaging and Augmented Reality, MIAR 2008
CityTokyo
Period08/8/108/8/2

ASJC Scopus subject areas

  • コンピュータ サイエンス(全般)
  • 生化学、遺伝学、分子生物学(全般)
  • 理論的コンピュータサイエンス

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