Optimal device for a low output impedance voltage source for Electrical Impedance Tomography (EIT) systems

Qureshi, T, Mehboob, B, Chatwin, C R and Wang, W (2012) Optimal device for a low output impedance voltage source for Electrical Impedance Tomography (EIT) systems. In: Electro/Information Technology (EIT), 2012 IEEE International Conference on. IEEE, pp. 1-6. ISBN 9781467308199

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Abstract

The key component in bio-impedance measurement systems is an excitation source. Electrical Impedance Tomography (EIT) can be performed by injecting current and measuring the resulting voltages, or by applying voltages and measuring the current developed. Interesting characteristics of breast tissues mostly lie above 1MHz; therefore a wideband excitation source covering higher frequencies (i.e. above 1MHz) is required. A viable bandwidth envelope that can be used to design a constant EIT source having low output impedance is the main objective of this research. This paper proposes a voltage controlled voltage source (VCVS) tested by using different nonideal devices. The performance is compared with each other and decision is made which device can be used over a wide bandwidth (100Hz-20MHz) to design an excitation source. This paper also describes the performance of the designed EIT voltage source for different load conditions and load capacitances reporting signal-to-noise ratio, signal phase and output impedance of the source. Preliminary data obtained using Pspice is used to demonstrate the high-bandwidth performance of the source.

Item Type: Book Section
Keywords: EIT; Electrical impedance tomography; Impedance tomography hardware; Voltage source
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: Q Science > QA Mathematics
Q Science > QA Mathematics > QA0075 Electronic computers. Computer science
R Medicine > R Medicine (General) > R856 Biomedical engineering. Electronics. Instrumentation
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800 Electronics
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Depositing User: Chris Chatwin
Date Deposited: 30 Aug 2012 09:00
Last Modified: 30 Aug 2012 09:00
URI: http://sro.sussex.ac.uk/id/eprint/40501
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