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Extraction of Cole parameters from the electrical bioimpedance spectrum using stochastic optimization algorithms

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Abstract

Fitting the measured bioimpedance spectroscopy (BIS) data to the Cole model and then extracting the Cole parameters is a common practice in BIS applications. The extracted Cole parameters then can be analysed as descriptors of tissue electrical properties. To have a better evaluation of physiological or pathological properties of biological tissue, accurate extraction of Cole parameters is of great importance. This paper proposes an improved Cole parameter extraction based on bacterial foraging optimization (BFO) algorithm. We employed simulated datasets to test the performance of the BFO fitting method regarding parameter extraction accuracy and noise sensitivity, and we compared the results with those of a least squares (LS) fitting method. The BFO method showed better robustness to the noise and higher accuracy in terms of extracted parameters. In addition, we applied our method to experimental data where bioimpedance measurements were obtained from forearm in three different positions of the arm. The goal of the experiment was to explore how robust Cole parameters are in classifying position of the arm for different people, and measured at different times. The extracted Cole parameters obtained by LS and BFO methods were applied to different classifiers. Two other evolutionary algorithms, GA and PSO were also used for comparison purpose. We showed that when the classifiers are fed with the extracted feature sets by BFO fitting method, higher accuracy is obtained both when applying on training data and test data.

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Acknowledgments

This study was funded in part by Mitacs Canada, Connect Canada, NSERC and Nuraleve Inc. We would also like to thank our colleagues, Dr. Isar Nejadgholi, Hershel Caytak, Dr. Abeye Mekonnen and Dr. Crystal Blais for providing us with the data.

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  1. School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON, K1N 6N5, Canada

    Shiva Gholami-Boroujeny & Miodrag Bolic

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  1. Shiva Gholami-Boroujeny
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  2. Miodrag Bolic
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Correspondence to Shiva Gholami-Boroujeny.

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Gholami-Boroujeny, S., Bolic, M. Extraction of Cole parameters from the electrical bioimpedance spectrum using stochastic optimization algorithms. Med Biol Eng Comput 54, 643–651 (2016). https://doi.org/10.1007/s11517-015-1355-y

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  • DOI: https://doi.org/10.1007/s11517-015-1355-y

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