[A study of coordinates transform iterative fitting method to extract bio-impedance model parameters bio-impedance model parameters].
A new algorithm, the coordinates transform iterative optimizing method based on the least square curve fitting model, is presented. This arithmetic is used for extracting the bio-impedance model parameters. It is superior to other methods, for example, its speed of the convergence is quicker, and its calculating precision is higher. The objective to extract the model parameters, such as Ri, Re, Cm and alpha, has been realized rapidly and accurately. With the aim at lowering the power consumption, decreasing the price and improving the price-to-performance ratio, a practical bio-impedance measure system with double CPUs has been built. It can be drawn from the preliminary results that the intracellular resistance Ri increased largely with an increase in working load during sitting, which reflects the ischemic change of lower limbs.
Zhou
Liming
L
Department of Biomedical Engineering, School of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
Yang
Yuxing
Y
Yuan
Shiying
S
D000465:Algorithms; D017097:Electric Impedance; D006801:Humans; D007511:Ischemia / Q000175:diagnosis* / Q000503:physiopathology; D035002:Lower Extremity / Q000098:blood supply*; D008962:Models, Theoretical; D012815:Signal Processing, Computer-Assisted; D013057:Spectrum Analysis / Q000379:methods