Determination of displacement, stress- and strain-distribution in the human heart a fe-model on the basis of mr imaging

P. Schmid, M. Stuber, P. Boesiger, O. M. Hess, P. Niederer

Research output: Contribution to journalArticlepeer-review

Abstract

The determination of characteristic cardiac parameters, such as displacement, stress and strain distribution are essential for an understanding of the mechanics of the heart. The calculation of these parameters has been limited until recently by the use of idealised mathematical representations of biventricular geometries and by applying simple material laws. On the basis of 20 short axis heart slices and in consideration of linear and nonlinear material behaviour we have developed a FE model with about 100 000 degrees of freedom. Marching Cubes and Phong' s incremental shading technique were used to visualise the three dimensional geometry. In a quasistatic FE analysis continuous distribution of regional stress and strain corresponding to the endsystolic state were calculated. Substantial regional variation of the Von Mises stress and the total strain energy were observed at all levels of the heart model. The results of both the linear clastic model and the model with a nonlinear material description (Mooney-Rivlin) were compared. While the stress distribution and peak stress values were found to be comparable, the displacement vectors obtained with the nonlinear model were generally higher in comparison with the linear elastic case indicating the need to include nonlinear effects.

Original languageEnglish (US)
Pages (from-to)209-214
Number of pages6
JournalTechnology and Health Care
Volume3
Issue number3
DOIs
StatePublished - Jan 1 1995

Keywords

  • Distribution of stress
  • FE analysis
  • Heart
  • Human
  • Mechanics

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering
  • Biomaterials
  • Information Systems
  • Biomedical Engineering
  • Health Informatics

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