Journal
PHYSIOLOGICAL MEASUREMENT
Volume 40, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6579/ab3666
Keywords
Fricke-Morse model; transient response; bioelectrical impedance analysis; single-frequency measurement
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Funding
- China Scholarship Council (CSC) [201706130103]
- National Natural Science Foundation of China [31671002]
- Scientific Research Foundation of Shaanxi Province for Returned Chinese Scholars [2017004]
- Shaanxi Natural Science Foundation [2016JM6046]
- National Key Research and Development Program of China [2016YFF0203402]
- NIH [R01 NS091159]
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Objective: The Fricke-Morse impedance model is widely used in bioelectrical impedance analysis (BIA), which is usually fitted by multi-frequency electrical impedance data. Here, we propose a novel numerical method for estimating the model parameters using single-frequency sinusoidal excitation. Approach: A single-frequency sinusoidal signal is used as the current excitation, from which the initial transient, the steady-state and the ending transient voltage responses along with the current excitation are recorded. The model parameters can be then estimated with numerical calculations from the acquired signals. Main results: Simulation and experimental measurements are verified on a 2R1C circuit by using a 50 kHz sinusoidal current excitation. The results show that the maximum relative errors of the estimated model parameters are <1% in simulation with 2% noise and <2% in experimental measurement. Significance: The proposed method could extend the applications of wideband BIA by using single-frequency excitation, rather than multi-frequency excitation as is done today.
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