A high accuracy broadband measurement system for time resolved complex bioimpedance measurements
| Autor: | Ankit Malhotra, Steffen Kaufmann, Martin Ryschka, Gunther Ardelt |
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| Rok vydání: | 2014 |
| Předmět: |
Male
Time Factors Materials science Physiology Acoustics Biomedical Engineering Biophysics Phase (waves) law.invention law Physiology (medical) Electric Impedance Calibration Electronic engineering Humans Electrical impedance Solanum tuberosum Signal processing Phantoms Imaging System of measurement Temperature Reproducibility of Results Signal Processing Computer-Assisted Forearm Dielectric Spectroscopy Resistor Alternating current Voltage |
| Zdroj: | Physiological Measurement. 35:1163-1180 |
| ISSN: | 1361-6579 0967-3334 |
| DOI: | 10.1088/0967-3334/35/6/1163 |
| Popis: | Bioimpedance measurements are useful tools in biomedical engineering and life science. Bioimpedance is the electrical impedance of living tissue and can be used in the analysis of various physiological parameters. Bioimpedance is commonly measured by injecting a small well known alternating current via surface electrodes into an object under test and measuring the resultant surface voltages. It is non-invasive, painless and has no known hazards. This work presents a field programmable gate array based high accuracy broadband bioimpedance measurement system for time resolved bioimpedance measurements. The system is able to measure magnitude and phase of complex impedances under test in a frequency range of about 10-500 kHz with excitation currents from 10 µA to 5 mA. The overall measurement uncertainties stay below 1% for the impedance magnitude and below 0.5° for the phase in most measurement ranges. Furthermore, the described system has a sample rate of up to 3840 impedance spectra per second. The performance of the bioimpedance measurement system is demonstrated with a resistor based system calibration and with measurements on biological samples. |
| Databáze: | OpenAIRE |
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