Parameter Identification for a New Circuit Model Aimed to Predict Body Water Volume

• Main Authors: GHEORGHE, A.-G., MARIN, C.-V., CONSTANTINESCU, F., NITESCU, M.
• Format: Article
• Language: English
• Published: Stefan cel Mare University of Suceava 2012-11-01
• Series: Advances in Electrical and Computer Engineering
• Subjects: bioimpedance; circuit synthesis; frequency response; impedance measurement; passive circuits
• Online Access: http://dx.doi.org/10.4316/AECE.2012.04013

Intracellular and extracellular water volumes in the human body have been computed using a sequence of models starting with a linear first order RC circuit (Cole model) and finishing with the De Lorenzo model. This last model employs a fractional order impedance whose parameters are identified using the frequency characteristics of the impedance module and phase, the latter being not unique. While the Cole model has a two octaves frequency validity range, the De Lorenzo model can be used for three decades. A new linear RC model, valid for a three decades frequency range, is proposed. This circuit can be viewed as an extension of the Cole model for a larger frequency interval, unlike similar models proposed by the same authors.