Estimation of cardiac bidomain parameters from extracellular measurement: Two dimensional study

R. Sadleir, C. Henriquez

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Cardiac tissue conductivity measurements can be used to assess the electrical substrate underlying normal and abnormal wavefront propagation. We describe a method of solving the inverse cardiac bidomain model to estimate average longitudinal and transverse intra and extra-cellular conductivities and fiber angle relative to an electrode array placed arbitrarily on the epi- or endocardial surface. A Newton-Raphson reconstruction method and two Tikhonov-type regularizations were able to stably identify conductivities and fiber angles in tissue models having anisotropies similar to those in real cardiac tissue. The reconstruction methods were tested with data from increasingly realistic two dimensional cardiac bidomain models and performed well both when measurement noise was added, and when simulated experimental and forward model matching was diminished. This approach may be a suitable basis for continuous monitoring of myocardial condition in-vivo via a catheter based electrode array.

Original languageEnglish (US)
Pages (from-to)1289-1303
Number of pages15
JournalAnnals of Biomedical Engineering
Volume34
Issue number8
DOIs
StatePublished - Aug 1 2006
Externally publishedYes

Keywords

  • Anisotropy
  • Bidomain model
  • Cardiac tissue
  • Conductivity
  • Fiber angle
  • Impedance measurement
  • Regularization

ASJC Scopus subject areas

  • Biomedical Engineering

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