Development of a Miniaturized, Low-Cost Electrical Impedance Tomography System

作     者：Sun, Nan Yang, Dan Xu, Bin Li, Shijun 

作者机构：Northeastern Univ Coll Informat Sci & Engn Shenyang 110819 Peoples R China Northeastern Univ Coll Informat Sci & Engn Natl Frontiers Sci Ctr Ind Intelligence & Syst Opt Shenyang 110819 Peoples R China Northeastern Univ Sch Comp Sci & Engn Shenyang 110169 Peoples R China 

出 版 物：《IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT》 (IEEE Trans. Instrum. Meas.)

年 卷 期：2025年第74卷

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0804[工学-仪器科学与技术] 

基　　金：National Natural Science Foundation of China [52477230, U22A20221, 61836011, 71790614] The 111 Project [B16009] Natural Science Foundation of Liaoning Province [2022-MS-119] 

主　　题：Electrical impedance tomography Electrodes Image reconstruction Impedance Data processing Data acquisition Wireless fidelity Monitoring Circuits Biomedical monitoring Adaptive gain amplifying complex programmable logic device (CPLD) electrical impedance tomography (EIT) image reconstruction miniaturized EIT system 

摘      要：This work focuses on the development of a miniaturized, wearable, and low-cost (25 $) electrical impedance tomography (EIT) system based on ESP32 Microcontroller Unit (MCU) combined with micro-size Complex programmable logic device (CPLD). The voltage data is sent to a PC via Wi-Fi and the image is reconstructed with EIDORS in MATLAB. The hardware of the designed EIT system includes an acquisition board, a data processing board powered by a 1000 mAh Li-Po battery, a configurable electrode-sensor unit, and a personal computer (PC). The system is developed to meet the EIT performance requirement with the smallest possible size, and its printed circuit boards (PCBs) are with a size of 40 mm x 36 mm. The system supports 2 to 16 electrodes, and configurable measuring pattern with self-adaptive gain control. It can provide voltage data frames at more than 30 fps. The amplitude of the excitation current can be adjusted from 0.3 mAp (mA peak) to 2.0 mAp (complies with the IEC Standard 60601-1) when the excitation frequency is 97.65625 kHz. Results indicate that the highest signal-to-noise ratio (SNR) is 61.6 dB, the average impedance measuring accuracy (IMA) is 97.9%, the average image correlation coefficient (ICC) is 71.2%. It is potential that the proposed EIT system can be developed into a beneficial, convenient for physicians and patients in various applications.