The sensitivity of focused electrical impedance measurements

Physiological Measurement
Naimul IslamAdrian J Wilson

Abstract

One of the problems with tetrapolar impedance measurements is the lack of spatial sensitivity within the measured volume. In this paper we compare the sensitivity of tetrapolar measurements and the focused impedance measurements (FIM) proposed by Rabbani et al (1999 Ann. New York Acad. Sci. 873 408-20), which give an improved sensitivity profile. Using a previously validated model of sensitivity based on Geselowitz's lead theory, the sensitivity of FIM using eight, six and four electrodes was investigated. All electrode configurations showed a maximum in the average sensitivity of a plane at a depth of one-third of the drive-receive electrode spacing. No difference was found in the sensitivity value of this maximum between electrode configurations having the same drive-receive electrode spacing. The six- and eight-electrode configurations showed negative sensitivity regions down to half of the drive-receive electrode spacing, whilst the four-electrode measurement showed negative sensitivity regions down to one-third of the drive-receive electrode spacing. The single peak in sensitivity beneath the centre of the electrode configuration became dominant at 0.56, 1.4 and 0.14 of the receive electrode spacing for the eight-, six- an...Continue Reading

References

Nov 1, 1986·IEEE Transactions on Bio-medical Engineering·Y J ZhangD R Bassett
Jan 1, 1971·IEEE Transactions on Bio-medical Engineering·D B Geselowitz
Jun 18, 1999·Annals of the New York Academy of Sciences·C A González-CorreaK D Bardhan
Jun 18, 1999·Annals of the New York Academy of Sciences·K S RabbaniT Akter
Mar 10, 2001·Physiological Measurement·A J WilsonB H Brown
Jun 19, 2003·Physiological Measurement·Pedro Bertemes-FilhoAdrian J Wilson
Mar 19, 2008·Annals of Biomedical Engineering·K S Rabbani, M A S Karal

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Citations

Aug 1, 2016·Medical Engineering & Physics·E NaydenovaA J Wilson
Apr 26, 2012·Physiological Measurement·Nusrat Jahan SurovyK Siddique-e Rabbani
May 23, 2014·Physiological Measurement·F J PettersenJ O Høgetveit
May 23, 2014·Physiological Measurement·Abdullah Al AminK Siddique-e Rabbani
Sep 19, 2019·European Biophysics Journal : EBJ·Shamor Kanti RoyKhondkar Siddique-E Rabbani
Jan 15, 2021·Biomedical Physics & Engineering Express·Víctor Hugo Mosquera LeytonCarlos Felipe Rengifo Rodas
Dec 31, 2018·Journal of Electrical Bioimpedance·Muhammad Abdul Kadir, K Siddique-E Rabbani
Dec 26, 2019·Journal of Electrical Bioimpedance·Rashida HaqueK Siddique-E Rabbani

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