The sensitivity of focused electrical impedance measurements
Islam, Naimul, Rabbani, K. Siddique-e and Wilson, Adrian J.. (2010) The sensitivity of focused electrical impedance measurements. Physiological Measurement, Vol.31 (No.8). S97-S109. ISSN 0967-3334Full text not available from this repository.
Official URL: http://dx.doi.org/10.1088/0967-3334/31/8/S08
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- and four-electrode configurations respectively. Thus, the four-electrode FIM configuration gives a single peak closest to the surface.
|Item Type:||Journal Article|
|Subjects:||Q Science > QH Natural history > QH301 Biology
Q Science > QP Physiology
|Divisions:||Faculty of Science > Physics|
|Journal or Publication Title:||Physiological Measurement|
|Publisher:||Institute of Physics Publishing Ltd.|
|Number of Pages:||13|
|Access rights to Published version:||Restricted or Subscription Access|
|Title of Event:||10th International Conference on Electrical Impedance Tomography|
|Location of Event:||Univ Manchester, Sch Math, Manchester, ENGLAND|
|Date(s) of Event:||JUN 15-19, 2009|
Actions (login required)