A Feasibility Study of the Suitability of an AD5933-based Spectrometer for EBI Applications

Abstract

Electrical Bioimpedance (EBI) measurements have proven their validity in several medical applications like body composition analysis and detection of melanoma among others. The successful application of EBI technology on the field of medicine has lead the way for applications in the field of personal healthcare and body performance in the field of sports. Due to the widespread use of the EBI technology and rising of new EBI applications requiring system portability or even suitable to wear, the manufacturer Analog devices has introduced in the market the first integrated system dedicated to measure EBI, the impedance network analyzer AD5933. The availability of this EBI spectrometer device opens up new horizons for the integration of the measurement systems to meet the demands of new EBI applications and allowing the development of portable and even wearable measurement systems. This project is focused on the AD5933 impedance network analyzer, and it aims to identify the EBI applications in which, the use of an AD5933 device is suitable. To adapt the AD5933 device for biomedical measurements an Analog Front-End (AFE) has been used to enable the system for 4-electrodes measurements. In order to evaluate the performance of AD5933 with the AFE, experimental measurements on electrical equivalent models have been taken with the AD5933+4E-AFE system and the EBI spectrometer Impedimed SFB7. The obtained impedance spectral data have been used to estimate the values of the equivalent circuit under measurement and the estimated values have been mutually compared in terms of estimation accuracy.