Study of Voltage Control Current Source in Electrical Impedance Tomography System

Author

Li Zhangyong ; Xu Zhui ; Ren Chaoshi ; Wang Wei ; Zhao Dechun ; Zhang Huiquan

Author_Institution

Biomed. Eng. Res. Center, Chongqing Univ. of Posts & Telecommun., Chongqing, China

fYear

2010

fDate

18-20 June 2010

Firstpage

1

Lastpage

4

Abstract

A steady and efficient Voltage Control Current Source (VCCS ) with broad bandwidth plays a very important role in the quality of final images for Electrical Impedance Tomography (EIT) system. Therefore, two models of current source are proposed in the paper: Advanced Howland VCCS and Double Operational Amplifiers VCCS. Both of the two models are simulated through a software named Multisim, and the results of simulation show that both models can keep an output impedance higher than 1M Ω when the frequency changes from 10 kHz to 1 MHz and the load varies from 100 Ω to 1000 Ω .The results also show that both models meet the requirements of VCCS in EIT system, they are hoped to provide usefull approaches for the design of practical VCCS of EIT system.

Keywords

active networks; biomedical electronics; biomedical imaging; electric impedance imaging; operational amplifiers; Howland VCCS; Multisim software; double operational amplifiers; electrical impedance tomography system; frequency 10 kHz to 1 MHz; resistance 100 ohm to 1000 ohm; voltage control current source; Biological system modeling; Biomedical engineering; Biomedical measurements; Feedback circuits; Humans; Impedance; Operational amplifiers; Tomography; Voltage control; Voltage measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Bioinformatics and Biomedical Engineering (iCBBE), 2010 4th International Conference on

Conference_Location

Chengdu

ISSN

2151-7614

Print_ISBN

978-1-4244-4712-1

Electronic_ISBN

2151-7614

Type

conf

DOI

10.1109/ICBBE.2010.5515066

Filename

5515066