Digital demodulator for electrical impedance imaging

Author

Smith, Robert W M ; Freeston, Ian L. ; Brown, Brian H.

Author_Institution

Dept. of Electr. & Electron. Eng., Sheffield Univ., UK

fYear

1989

fDate

9-12 Nov 1989

Firstpage

1744

Abstract

Possible applications of a real-time electrical impedance tomography system are discussed, and ways are considered in which the required signal-to-noise (SNR) ratio can be attained. It is shown that a digital demodulator based on matched filter theory provides an SNR improvement equal to that of its analog counterpart. In addition, the digital filter is more versatile than its analog equivalent. For example, the measurement time can be varied in software, to allow for different frame rates. Experimental results show that the filter operates as expected

Keywords

bioelectric phenomena; biomedical electronics; computerised tomography; demodulators; digital demodulator; digital filter; electrical impedance imaging; frame rate; matched filter theory; measurement time; medical diagnostic imaging; real-time electrical impedance tomography system; signal-to-noise ratio; Biomedical imaging; Demodulation; Frequency measurement; Impedance; Matched filters; Monitoring; Real time systems; Sampling methods; Signal to noise ratio; Tomography;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 1989. Images of the Twenty-First Century., Proceedings of the Annual International Conference of the IEEE Engineering in

Conference_Location

Seattle, WA

Type

conf

DOI

10.1109/IEMBS.1989.96434

Filename

96434