Abstract
The Cole model is a widely used fractional circuit model in electrical bioimpedance applications for evaluating the content and status of biological tissues and fluids. Existing methods for estimating the Cole impedance parameters are often based on multi-frequency data obtained from stepped-sine measurements fitted using a complex nonlinear least square (CNLS) algorithm. Newly emerged numerical methods from the magnitude of electrical bioimpedance data-only do not need CNLS fitting, but they still require multi-frequency stepped-sine data. This study proposes a novel approach to estimating the Cole impedance parameters that combines a numerical and time-domain fitting method based on a single-frequency DC-biased sinusoidal current excitation. First, the transient and steady-state voltage responses along with the current excitation are acquired in electrical bioimpedance measurement. From the sampled data, a numerical method is applied to provide the initial estimation of the Cole impedance parameters, which are then used in a time-domain iterative fitting algorithm. The accuracy of the algorithm proposed is tested with noisy electrical bioimpedance simulations. The maximum relative error of the estimated Cole impedance parameters is 1% considering 2% (34 dB) additive Gaussian noise. Experimental measurements performed on a 2R-1C circuit and some fruit samples show a mean difference less than 1% and 5%, respectively, compared to the Cole impedance parameters estimated from a commercial electrical bioimpedance analyzer performing stepped-sine measurements and CNLS fitting. This is the first method that allows estimating the Cole impedance parameters from single-frequency electrical bioimpedance data. The approach presented could find broad use in many applications, including single-frequency body impedance analysis.
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Data Availability Statement
The datasets generated during and/or analyzed during the current study are available from the first author on reasonable request.
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Acknowledgements
The work of F. Zhang was supported by China Scholarship Council through the Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA, under Grant 201706130103. The work of Z. Teng was supported by the National Key Research and Development Program of China under Grant 2016YFF0203402. The work of Y. Yang was supported in part by the National Natural Science Foundation of China under Grant 31671002, the Scientific Research Foundation of Shaanxi Province for Returned Chinese Scholars under Grant 2017004, and the Shaanxi Natural Science Foundation under Grant 2016JM6046. The work of J. Li was supported by the National Natural Science Foundation of China under Grant 51907062. The work of S. B. Rutkove was supported by NIH under Grant R01 NS091159. The work of B. Sanchez was supported by NIH under Grant R41 NS112029-01A1.
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Dr. Rutkove has equity in, and serves a consultant and scientific advisor to, Myolex, Inc., a company that designs impedance devices for clinical and research use; he is also a member of the company’s Board of Directors. The company also has an option to license patented impedance technology of which Dr. Rutkove is named as an inventor. Dr. Sanchez is Co-Founder and has equity in Haystack Dx, Inc. a company that commercializes needle impedance technology for clinical and research use. The company also has an option to license patented impedance technology of which Dr. Sanchez is named as an inventor. Dr. Sanchez serves as a Scientific Advisory Board Member for Ioniq Sciences, Inc., a company that commercializes impedance related technology for clinical use. He serves also as a consultant to Myolex, Inc., Impedimed, Inc., Texas Instruments, Inc., and Gideon Health, Inc., four companies that develop impedance related technology for consumer, research and clinical use.
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Zhang, F., Teng, Z., Yang, Y. et al. A Novel Method for Estimating the Fractional Cole Impedance Model Using Single-Frequency DC-Biased Sinusoidal Excitation. Circuits Syst Signal Process 40, 543–558 (2021). https://doi.org/10.1007/s00034-020-01512-9
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DOI: https://doi.org/10.1007/s00034-020-01512-9