Quasi-linear viscoelastic modeling of arterial wall for surgical simulation

Tao Yang, Chee Kong Chui, Rui Qi Yu, Jing Qin, Stephen K.Y. Chang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)

Abstract

Purpose: Realistic soft tissue deformation modeling and haptic rendering for surgical simulation require accurate knowledge of tissue material characteristics. Biomechanical experiments on porcine tissue were performed, and a reduced quasi-linear viscoelastic model was developed to describe the strain-dependent relaxation behavior of the arterial wall. This information is used in surgical simulation to provide a realistic sensation of reduction in strength when the user holds a virtual blood vessel strained at different levels. Materials and methods: Twelve pieces of porcine abdominal artery were tested with uniaxial elongation and relaxation test in both circumferential and longitudinal directions. The mechanical property testing system consists of automated environment control, testing, and data collection mechanism. A combined logarithm and polynomial strain energy equation was applied to model the elastic response of the specimens. The reduced relaxation function was modified by integrating a rational equation as a corrective factor to precisely describe the strain-dependent relaxation effects. Results: The experiments revealed that (1) stress is insensitive to strain rate in arterial tissue when the loading rate is low, and (2) the rate of stress relaxation of arterial wall is highly strain dependent. The proposed model can accurately represent the experimental data. Stress-strain function derived from the combined strain energy function is able to fit the tensile experimental data with R2equals to 0.9995 in circumferential direction and 0.999 in longitudinal direction. Modified reduced relaxation function is able to model the strain-dependent relaxation with R2equals to 0.9686 in circumferential direction and 0.988 in longitudinal direction. Conclusion: The proposed model, based on extensive biomechanical experiments, can be used for accurate simulation of arterial deformation and haptic rendering in surgical simulation. The resultant model enables stress relaxation status to be determined when subjected to different strain levels.
Original languageEnglish
Pages (from-to)829-838
Number of pages10
JournalInternational journal of computer assisted radiology and surgery
Volume6
Issue number6
DOIs
Publication statusPublished - 1 Jan 2011
Externally publishedYes

Keywords

  • Arterial wall
  • Constitutive modeling
  • Medical simulation
  • Strain dependency
  • Viscoelastic

ASJC Scopus subject areas

  • Surgery
  • Radiology Nuclear Medicine and imaging
  • Health Informatics

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