A Methodology to Assist in Improvements of Low-cost Electrical Impedance Tomography Systems



Electrical Impedance Tomography (EIT), Data Acquisition Design, Error Analysis, Instrumentation, Measurement


Electrical Impedance Tomography (EIT) is a technique that enables the reconstruction of the impedance distributions inside a vessel in a multiphase flow of industrial processes. Such a technique combines a data acquisition (DAQ) system to inject a current and to measure the voltages on the sensors and an inverse problem technique to reconstruct the image properly. This problem is highly ill-conditioned, causing errors to produce instabilities. Therefore, when performing the acquisition, the DAQ system must have adequate accuracy to allow the reconstruction of images with good quality. To avoid these measurement inaccuracies, this paper introduces a methodology that aid in the process of development of low-cost systems. It consists of investigating the errors in the current version of the system. Further, predicting the systematic errors of each subsystem by modeling its frequency response by Simulation Program with Integrated Circuit Emphasis (SPICE). From this information, it is possible to perform critical analysis, aiding design decisions.


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Author Biographies

Bruno Furtado de Moura, Universidade Federal de Catalão

Bruno de Moura received the B.Eng. and M.Sc. degrees in Mechanical Engineering from the Federal University of Espírito Santo (UFES), Vitória, Espírito Santo, Brazil, in 2012 and 2014, and received the D.Sc. degree in Mechanical Engineering Computacional Methods from the same university in 2020. In the same year he graduated, he joined and is currently Assistant Professor at the Federal University of Catalão. His topics of interest are inverse problem applied to engineering processes, and thermal and fluid flow modeling and instrumentation, such as electrical impedance tomography development.

Adriana Machado Malafaia da Mata, Universidade Federal do Espírito Santo

Adriana da Mata is a Ph.D. student in Mechanical Engineering at UFES. Her work focuses specifically on Electrical Impedance Tomography (EIT) and its application in multiphase mixtures. She was born in Minas Gerais (Brazil) and studied Chemical Engineeringat UCL, ES-Brazil (B.Eng. 2015). Then she joined Mechanical Engineering at UFES (M.Sc. 2017 and Ph.D. in progress).

Márcio Ferreira Martins, Universidade Federal do Espírito Santo

Marcio Martins is a Professor of Thermal Science at the Department of Mechanical Engineering of
UFES. His research is centered on multiphase reactive processes in thermal systems. His work aims
to study alternative paths to reduce energy waste by developing measurement devices and analysis
methods for high-temperature processes and systems. He was born in Amazon (Brazil). He studied
Mechanical Engineering at the Federal University of Para (B.Eng. 2003, M.Sc. 2005), and after at the University of Toulouse (Ph.D. 2008). Marcio joined UFES in 2009.

Francisco Hernan Sepulveda Palma, Universidad de Santiago de Chile

Francisco Sepúlveda Palma obtained his bachelor’s degree in applied physics in 2004 and an M.Sc.
degree in engineering physics in 2005 from the University of Santiago de Chile (Usach), Santiago,
Chile. He received a Ph.D. from the University of Toulouse, in 2009. Since 2012, he is an Associate
professor at the Department of Mechanical Engineering at Santiago University of Chile. He works on
heat transfer modeling and their implementation in the field of inverse problems for infrared images. Also on ultrasonics and automation and control.

Rogério Ramos, Universidade Federal do Espírito Santo

Rogério Ramos is Professor of Thermal Science and head of the Nucleus for Oil and Gas Flow Measurement (NEMOG) at the Department of Mechanical Engineering at UFES. His research is centered on flow measurement for the petroleum industry, developing techniques of measurements for multiphase systems. He was born in Vitoria-ES (Brazil) and studied Mechanical Engineering at UFES (B.Eng 1988, M.Sc. 1993), and after held his Ph.D. at the Federal University of Rio de Janeiro/ Cardiff University (1999). Rogério joined UFES in 1994.


F. Dickin and M. Wang, “Electrical resistance tomography for process

applications,” Measurement Science and Technology, vol. 7, no. 3, pp.

–260, mar 1996.

B. H. Brown and A. D. Seagar, “The Sheffield data collection system,”

Clinical Physics and Physiological Measurement, vol. 8, no. 4A, pp.

–97, nov 1987.

V. Kolehmainen, M. Vauhkonen, P. A. Karjalainen, and J. P. Kaipio,

“Assessment of errors in static electrical impedance tomography with ad-

jacent and trigonometric current patterns,” Physiological Measurement,

vol. 18, no. 4, pp. 289–303, 1997.

A. M. M. da Mata, B. F. de Moura, M. F. Martins, F. H. S.

Palma, and R. Ramos, “Parasitic capacitances estimation of an

electrical impedance tomography data acquisition system by bayesian

inference,” Measurement, vol. 174, p. 108992, 2021. [Online]. Available:


T. I. Oh, H. Wi, D. Y. Kim, P. J. Yoo, and E. J. Woo, “A fully parallel

multi-frequency EIT system with flexible electrode configuration: KHU

mark2,” Physiological Measurement, vol. 32, no. 7, pp. 835–849, jun

Mi Wang, Yixin Ma, N. Holliday, Yunfeng Dai, R. A. Williams, and

G. Lucas, “A high-performance EIT system,” IEEE Sensors Journal,

vol. 5, no. 2, pp. 289–299, April 2005.

X. Shi, W. Li, F. You, X. Huo, C. Xu, Z. Ji, R. Liu, B. Liu, Y. Li, F. Fu,

and X. Dong, “High-precision electrical impedance tomography data

acquisition system for brain imaging,” IEEE Sensors Journal, vol. 18,

no. 14, pp. 5974–5984, July 2018.

W. Li, J. Xia, G. Zhang, H. Ma, B. Liu, L. Yang, Y. Zhou, X. Dong,

F. Fu, and X. Shi, “Fast high-precision electrical impedance tomography

system for real-time perfusion imaging,” IEEE Access, vol. 7, pp.

570–61 580, 2019.

R. D. Cook, G. J. Saulnier, D. G. Gisser, J. C. Goble, J. C. Newell, and

D. Isaacson, “Act3: a high-speed, high-precision electrical impedance

tomograph,” IEEE Transactions on Biomedical Engineering, vol. 41,

no. 8, pp. 713–722, 1994.

Y. Mamatjan, S. Bohm, P. Gaggero, and A. Adler, “Evaluation of eit

system performance,” Physiological measurement, vol. 32, pp. 851–65,


K. G. Boone and D. S. Holder, “Current approaches to analogue ins-

trumentation design in electrical impedance tomography,” Physiological

Measurement, vol. 17, no. 4, pp. 229–247, nov 1996.

D. Holder, Electrical Impedance Tomography: Methods, History and Ap-

plications, ser. Series in Medical Physics and Biomedical Engineering.

CRC Press, 2004.

S. Wang, Y. Liu, K. Andrikopoulos, and W. Yin, “Design of a low-cost

integrated electrical resistance tomography(ert) system based on serial

bus,” in 2016 IEEE International Conference on Imaging Systems and

Techniques (IST), 2016, pp. 273–277.

M. Soleimani, “Electrical impedance tomography system: an open

access circuit design,” Biomedical engineering online, vol. 5, 2006.

M. Khalighi, B. Vosoughi Vahdat, M. Mortazavi, W. Hy, and M. So-

leimani, “Practical design of low-cost instrumentation for industrial

electrical impedance tomography (eit),” in 2012 IEEE International

Instrumentation and Measurement Technology Conference Proceedings,

, pp. 1259–1263.

B. F. de Moura, M. F. Martins, F. H. S. Palma, W. B. da Silva,

J. A. Cabello, and R. Ramos, “Design of a low-cost acquisition system

to reconstruct images through electrical resistance tomography,” IEEE

Latin America Transactions, vol. 18, no. 09, pp. 1592–1598, 2020.

V. Damasceno, D. Fratta, and P. Bosscher, “Development and validation

of a low-cost electrical resistivity tomographer for soil process monito-

ring,” Canadian Geotechnical Journal, vol. 46, pp. 842–854, 07 2009.

V. Mosquera, A. Arregui, R. Bragós, and C. Rengifo, “Implementation

of a low cost prototype for electrical impedance tomography based on

the integrated circuit for body composition measurement afe4300,” in

th International Joint Conference on Biomedical Engineering Systems

and Technologies (BIOSTEC 2018), 01 2018, pp. 121–127.

M. Vauhkonen, D. Vadasz, P. A. Karjalainen, E. Somersalo, and J. P.

Kaipio, “Tikhonov regularization and prior information in electrical im-

pedance tomography,” IEEE Transactions on Medical Imaging, vol. 17,

no. 2, pp. 285–293, April 1998.

E. Fransolet, M. Crine, G. L’Homme, D. Toye, and P. Marchot,

“Electrical resistance tomography sensor simulations: comparison with

experiments,” Measurement Science and Technology, vol. 13, no. 8, pp.

–1247, jul 2002.

A. Adler and R. Guardo, “Electrical impedance tomography: regularized

imaging and contrast detection,” IEEE Transactions on Medical Imaging,

vol. 15, no. 2, pp. 170–179, 1996.

M. Pelgrom, Analog-to-Digital Conversion, ser. SpringerLink : Bücher.

Springer New York, 2012.

S. Meeson, B. H. Blott, and A. L. T. Killingback, “EIT data noise

evaluation in the clinical environment,” Physiological Measurement,

vol. 17, no. 4A, pp. A33–A38, 1996.

A. J. Fitzgerald, D. S. Holder, L. Eadie, C. Hare, and R. H. Bayford, “A

comparison of techniques to optimize measurement of voltage changes

in electrical impedance tomography by minimizing phase shift errors,”

IEEE Transactions on Medical Imaging, vol. 21, no. 6, pp. 668–675,

M. Wang, Industrial Tomography: Systems and Applications, 1st ed.

Woodhead Publishing, Limited, 2015.

A. Mahnam, H. Yazdanian, and M. M. Samani, “Comprehensive study of

howland circuit with non-ideal components to design high performance

current pumps,” Measurement, vol. 82, pp. 94 – 104, 2016.

A. S. Tucker, R. M. Fox, and R. J. Sadleir, “Biocompatible, high

precision, wideband, improved howland current source with lead-lag

compensation,” IEEE Transactions on Biomedical Circuits and Systems,

vol. 7, no. 1, pp. 63–70, Feb 2013.

N. Kularatna, Electronic Circuit Design: From Concept to Implementa-


CRC Press, 2017.

J. Rubinstein, P. Penfield, and M. A. Horowitz, “Signal delay in RC tree

networks,” IEEE Transactions on Computer-Aided Design of Integrated

Circuits and Systems, vol. 2, no. 3, pp. 202–211, 1983.

P. B. Ishai, M. S. Talary, A. Caduff, E. Levy, and Y. Feldman, “Electrode

polarization in dielectric measurements: a review,” Measurement Science

and Technology, vol. 24, no. 10, p. 102001, 2013.

M. Wang, “Electrode models in electrical impedance tomography,”

Journal of Zhejiang University-SCIENCE A, vol. 6, no. 12, pp. 1386–

, 2005.

A. Hassibi, R. Navid, R. Dutton, and T. Lee, “Comprehensive study of

noise processes in electrode electrolyte interfaces,” Journal of Applied

Physics, vol. 96, 2004.

L. Counts and C. Kitchen, A Designer’s Guide to Instrumentation

Amplifiers, 3rd ed.

Analog Devices, 2006.

AD536A: Integrated Circuit True RMS-to-DC Converter Data Sheet

(Rev. G), Analog Devices, 2019.

A. Adler and W. R. B. Lionheart, “Uses and abuses of EIDORS: an

extensible software base for EIT,” Physiological Measurement, vol. 27,

no. 5, pp. S25–S42, apr 2006.

D. Gadani, V. Rana, S. Bhatnagar, A. Prajapati, and A.D.Vyas, “Effect

of salinity on the dielectric properties of water,” Indian Journal of Pure

and Applied Physics, vol. 50, pp. 405–410, 06 2012.

ADG506A/ADG507A: CMOS 8-/16-Channel Analog Multiplexers Data

Sheet (Rev. C), Analog Devices, 1998.

INA12x Precision, Low-Power Instrumentation Amplifiers datasheet

(Rev. E), Texas Instruments, 2019.


P. Bertemes-Filho, A. Felipei, and V. C. Vincence, “High accurate

Howland current source: Output constraints analysis,” Circuits and

Systems, vol. 4, no. 7, pp. 451–458, 2013.

K. Sakamoto, T. J. Yorkey, and J. G. Webster, “Some physical results

from an impedance camera,” Clinical Physics and Physiological Mea-

surement, vol. 8, no. 4A, pp. 71–76, nov 1987.

D. Bouchaala, O. Kanoun, and N. Derbel, “High accurate and wide-

band current excitation for bioimpedance health monitoring systems,”

Measurement, vol. 79, pp. 339 – 348, 2016.



How to Cite

de Moura, B. F., da Mata, A. M. M., Martins, M. F. ., Palma, F. H. S., & Ramos, R. (2021). A Methodology to Assist in Improvements of Low-cost Electrical Impedance Tomography Systems. IEEE Latin America Transactions, 100(XXX). Retrieved from https://latamt.ieeer9.org/index.php/transactions/article/view/5240

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