Electrical engineering

Physics

Inverse problem

Electrical impedance tomography

Subthreshold conduction

Transistor

Multiplexing

Current source

Mathematics

Optics

Engineering

Mathematical analysis

Voltage

Tikhonov regularization

Tomography

Acoustics

Electrical impedance

Electronic engineering

Computer science

Multiplexer

IEEE Sensors Journal

A portable electrical impedance tomography (EIT) system has been developed with Red Pitaya STEMlab for biomedical applications. The Red Pitaya STEMlab is a portable device to realize voltage generation and data acquisition for the EIT system. The EIT system includes a modified howland circuit as a voltage-controlled current source, a high-speed analogy multiplexer module, an 8-electrode array, and a personal computer. The generalized vector sampled pattern matching algorithm and the Tikhonov regularization algorithm are used to reconstruct the image generated by the EIT system. The reconstructed images by using Red Pitaya STEMlab are compared with a commercial impedance analyzer IM3570 within the frequencies of f = 100 KHz. The results show that the maximum difference of the image correlation between Red Pitaya STEMlab and IM3570 is 5.36%. Finally, the EIT system is used to image the conductivity of eggs during heating process. These results verified that the developed portable EIT system with Red Pitaya STEMlab could measure the biological tissue in a high accuracy at low cost.

Development of a Portable Electrical Impedance Tomography System for Biomedical Applications