Improved Understanding of the Sensitivity of Linear Tetrapolar Impedance Measurement (TPIM) and 8-Electrode Focused Impedance Method (FIM) in a Volume Conductor

Authors

  • Sayed Parvez Ahmed Department of Biomedical Physics & Technology, University of Dhaka, Dhaka-1000
  • M Abdul Kadir Department of Biomedical Physics & Technology, University of Dhaka, Dhaka-1000
  • Golam Dastegir Al Quaderi Department of Physics, University of Dhaka, Dhaka-1000
  • Rubina Rahman Department of Physics, Jahangirnagar University, Savar, Dhaka
  • K Siddique e Rabbani Department of Biomedical Physics & Technology, University of Dhaka, Dhaka-1000

DOI:

https://doi.org/10.3329/bjmp.v8i1.33931

Keywords:

Electrical Impedance, Localized impedance, TPIM, FIM, Finite Element Method, Planar sensitivity

Abstract

Tetrapolar Impedance Measurement (TPIM) is a 4-electrode impedance measurement system appropriate for a volume conductor in which current is driven through a pair of electrodes while potential developed across another pair of electrodes is measured to provide a value of transfer impedance. The 8-electrode Focused Impedance Method (FIM-8) consists of two concentric and orthogonal linear TPIM systems with their transfer impedances added for the purpose of localizing the central zone. Detailed 3D sensitivity studies are necessary for proper application of the techniques in specific biomedical applications and most reported work present point sensitivity distributions. The present work mainly focuses on planar average sensitivity in planes parallel to the electrode plane and its variation with depth due to different combinations of electrode separations both for current drive pair and the potential measuring pair. This was obtained through finite element simulation using COMSOL Multiphysics software for a 40x40x40cm3 volume. The results give useful information that can be used to design electrode configurations and measurement modalities for various applications.

Bangladesh Journal of Medical Physics Vol.8 No.1 2015 22-31

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Published

2017-09-10

How to Cite

Ahmed, S. P., Kadir, M. A., Quaderi, G. D. A., Rahman, R., & Rabbani, K. S. e. (2017). Improved Understanding of the Sensitivity of Linear Tetrapolar Impedance Measurement (TPIM) and 8-Electrode Focused Impedance Method (FIM) in a Volume Conductor. Bangladesh Journal of Medical Physics, 8(1), 22–31. https://doi.org/10.3329/bjmp.v8i1.33931

Issue

Vol. 8 No. 1 (2015)

Section

Original Papers