A Digital System for Bioimpedance and Electrical Impedance Tomography Measurement System_Journal of Biomedical Engineering

Authors：

 CHENXiaoyan , GAONana , HUANGHuafang

School of Electrical Information and Automation, Tianjin University of Science and Technology, Tianjin 300222, China;

Corresponding author：

CHENXiaoyan, Email: cxywxr@tust.edu.cn

Keywords：

digital electrode; bioimpedance measurement; electrical impedance tomography; AD5933; wireless communication

DOI：

10.7507/1001-5515.20150105

Video：

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Abstract Full text Figures/Tables Video References Cited by

A digital system for bioimpedance and electrical impedance tomography (EIT) measurement controlled by an ATmega16 microcontroller was constructed in our laboratory. There are eight digital electrodes using AD5933 to measure the impedance of the targets, and the data is transmitted to the computer wirelessly through nRF24L01. The structure of the system, circuit design, system testing, vitro measurements of animals' tissues and electrical impedance tomography are introduced specifically in this paper. The experimental results showed that the system relative error was 0.42%, and the signal noise ratio was 76.3 dB. The system not only can be used to measure the impedance by any two electrodes within the frequency of 1-100 kHz in a sweep scanning, but also can reconstruct the images of EIT. The animal experiments showed that the data was valid and plots were fitting with Cole-Cole theory. The testing verified the feasibility and effectiveness of the system. The images reconstructed of a salt-water tank are satisfactory and match with the actual distribution of the tank. The system improves the effectiveness of the front-end measuring signal and the stability of the system greatly.

Citation： CHENXiaoyan, GAONana, HUANGHuafang. A Digital System for Bioimpedance and Electrical Impedance Tomography Measurement System. Journal of Biomedical Engineering, 2015, 32(3): 575-580. doi: 10.7507/1001-5515.20150105 Copy

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12.	王达, 王化祥, 崔自强, 等.一种集成式阻抗谱测量系统[J].传感器与微系统, 2012, 31(12):94-100.
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14.	陈晓艳, 赵秋红, 李宏英, 等.电阻抗与EIT测量微系统设计[J].中国生物医学工程学报, 2013, 32(6):757-761.
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1. 刘鑫, 任超世.几种发展中的生物电阻抗成像方法和系统[J].医疗卫生装备, 2008, 29(10):33-35.
2. 孙晓彤, 郝会玲, 沙洪.一种基于FPGA的数字EIT系统的实验研究[J].中国生物医学工程学报, 2013, 32(3):266-272.
3. 董秀珍.生物电阻抗成像研究的现状与挑战[J].中国生物医学工程学报, 2008, 27(5):641-649.
4. CHEN X Y, WANG H X, ZHAO B, et al. Lung ventilation functional monitoring based on electrical impedance tomography[J]. Trans Tianjin Univ, 2009, 15(1):7-12.
5. 李静, 陈世利, 靳世久.基于AD5933的阻抗分析仪的设计和实现[J].现代科学仪器, 2009, 4(2):28-30.
6. 黎步银, 黄兆祥, 幸会.基于AD5933的阻抗频谱测试系统设计与实现[J].微计算机信息, 2008, 24(10-2):288-230.
7. 温新华, 颜小飞, 安冬.基于AD5933的便携式阻抗仪研制[J].计算机测量与控制, 2013, 21(4):1090-1108.
8. HOJA J, LENTKA G. Interface circuit for impedance sensors using two specialized single-chip microsystems[J]. Sensors and Actuator A:physical, 2010, 163(1):191-197.
9. HOJA J, LENTKA G. Portable analyzer for impedance spectroscopy[C]//XIX IMEKO World Congress on Fundamental and Applied Metrology. Lisbon:2009:497-502.
10. 李蛟, 杨仁锟, 肖峻.2.4GHz无线技术标准及ZigBee抗干扰性能[J].电信工程技术与标准化, 2006, (3):31-35.
11. ADI公司.AD5933英文产品数据手册[EB/DB].[2014-4-10].http://www.analog.com/static/imported-files/data_sheets/AD5933.pdf.
12. 王达, 王化祥, 崔自强, 等.一种集成式阻抗谱测量系统[J].传感器与微系统, 2012, 31(12):94-100.
13. 马岚, 杨玉星.生物电阻抗特征参数提取方法及测量系统的研究[J].航天医学与医学工程, 2002, 15(3):199-202.
14. 陈晓艳, 赵秋红, 李宏英, 等.电阻抗与EIT测量微系统设计[J].中国生物医学工程学报, 2013, 32(6):757-761.
15. 陈晓艳, 张静.采用阈值修正法改善电阻抗图像质量[J].中国生物医学工程学报, 2011, 30(4):484-486.

Journal of Biomedical Engineering

A Digital System for Bioimpedance and Electrical Impedance Tomography Measurement System

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