TITLE:
Digital biomedical electrical impedance tomography based on FPGA
AUTHORS:
Jiani Wu, Xiaoyan Chen, Zhonglin Ding
KEYWORDS:
Electrical Impedance Tomography; FPGA; Direct Digital Synthesis; Orthogonal Sequences Demodulation
JOURNAL NAME:
Journal of Biosciences and Medicines,
Vol.1 No.2,
December
10,
2013
ABSTRACT: A digital biomedical electrical impedance tomography
(EIT) system is developed with the aid of FPGA. The key elements of EIT system
are described specifically in the paper. The functions are realized to generate
excitation source, switch electrode channels, deal collected signals,
demodulate measured voltages etc. The system is tested by a circular tank with
16 stainless electrodes attached around the boundary. The adjacent incentive
adjacent measurement mode is adapted to collect boundary voltages of the interesting
field. By testing, the system works with 36 dB signal-to-noise ratio (SNR) when
1 mA 100 KHz current is applied into a homogenous tank.