Induced current electrical impedance tomography system: Experimental results and numerical simulations

Sharon Zlochiver, M. Michal Radai, Shimon Abboud, Moshe Rosenfeld, Xiu Zhen Dong, Rui Gang Liu, Fu Sheng You, Hai Yan Xiang, Xue Tao Shi

Research output: Contribution to journalArticlepeer-review

Abstract

In electrical impedance tomography (EIT), measurements of developed surface potentials due to applied currents are used for the reconstruction of the conductivity distribution. Practical implementation of EIT systems is known to be problematic due to the high sensitivity to noise of such systems, leading to a poor imaging quality. In the present study, the performance of an induced current EIT (ICEIT) system, where eddy current is applied using magnetic induction, was studied by comparing the voltage measurements to simulated data, and examining the imaging quality with respect to simulated reconstructions for several phantom configurations. A 3-coil, 32-electrode ICEIT system was built, and an iterative modified Newton-Raphson algorithm was developed for the solution of the inverse problem. The RMS norm between the simulated and the experimental voltages was found to be 0.08 ± 0.05 mV (<3%). Two regularization methods were implemented and compared: the Marquardt regularization and the Laplacian regularization (a bounded second-derivative regularization). While the Laplacian regularization method was found to be preferred for simulated data, it resulted in distinctive spatial artifacts for measured data. The experimental reconstructed images were found to be indicative of the angular positioning of the conductivity perturbations, though the radial sensitivity was low, especially when using the Marquardt regularization method.

Original languageEnglish
Pages (from-to)239-255
Number of pages17
JournalPhysiological Measurement
Volume25
Issue number1
DOIs
StatePublished - Feb 2004

Keywords

  • Bio-impedance
  • Experimental system
  • Finite volume
  • Newton-Raphson
  • Numerical simulation

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