3D simulation of EIT for monitoring impedance variations within the human head

Hugh Mccann; C. M. Towers; H. McCann; M. Wang; P. C. Beatty; C. J D Pomfrett; M. S. Beckt

doi:10.1088/0967-3334/21/1/315

3D simulation of EIT for monitoring impedance variations within the human head

Hugh Mccann, C. M. Towers, H. McCann, M. Wang, P. C. Beatty, C. J D Pomfrett, M. S. Beckt

Research output: Contribution to journal › Article › peer-review

Abstract

A preliminary analysis is presented concerning the use of EIT for detecting impedance inhomogeneities within the human brain. The work to date is centred around the monitoring of two distinct impedance variations: those associated with the application of a carotid clamp during surgery and changes caused by the redistribution of blood flow during auditory stimuli. Using the commercially available Ansoft Maxwell package, a 3D finite element model of the human head has been developed to solve the forward problem. The model is hemispherical in shape and comprises regions of brain, cerebrospinal fluid, skull and skin and includes 16 scalp electrodes each of area 1 cm2. Results from simulations using the model suggest that an EIT system, incorporating diametric current excitation, would require a voltage measurement sensitivity of 100-120 dB in order to detect the impedance variations in the above cases.

Original language	English
Pages (from-to)	119-124
Number of pages	5
Journal	Physiological Measurement
Volume	21
Issue number	1
DOIs	https://doi.org/10.1088/0967-3334/21/1/315
Publication status	Published - Feb 2000

Keywords

Brain
Electrical impedance tomography
Finite element
Head
Sensitivity
Simulation

Access to Document

10.1088/0967-3334/21/1/315

Cite this

@article{83c0ef12992f4df38b9edc478faaab48,

title = "3D simulation of EIT for monitoring impedance variations within the human head",

abstract = "A preliminary analysis is presented concerning the use of EIT for detecting impedance inhomogeneities within the human brain. The work to date is centred around the monitoring of two distinct impedance variations: those associated with the application of a carotid clamp during surgery and changes caused by the redistribution of blood flow during auditory stimuli. Using the commercially available Ansoft Maxwell package, a 3D finite element model of the human head has been developed to solve the forward problem. The model is hemispherical in shape and comprises regions of brain, cerebrospinal fluid, skull and skin and includes 16 scalp electrodes each of area 1 cm2. Results from simulations using the model suggest that an EIT system, incorporating diametric current excitation, would require a voltage measurement sensitivity of 100-120 dB in order to detect the impedance variations in the above cases.",

keywords = "Brain, Electrical impedance tomography, Finite element, Head, Sensitivity, Simulation",

author = "Hugh Mccann and Towers, {C. M.} and H. McCann and M. Wang and Beatty, {P. C.} and Pomfrett, {C. J D} and Beckt, {M. S.}",

year = "2000",

month = feb,

doi = "10.1088/0967-3334/21/1/315",

language = "English",

volume = "21",

pages = "119--124",

journal = "Physiological Measurement",

issn = "0967-3334",

publisher = "IOP Publishing Ltd",

number = "1",

}

TY - JOUR

T1 - 3D simulation of EIT for monitoring impedance variations within the human head

AU - Mccann, Hugh

AU - Towers, C. M.

AU - McCann, H.

AU - Wang, M.

AU - Beatty, P. C.

AU - Pomfrett, C. J D

AU - Beckt, M. S.

PY - 2000/2

Y1 - 2000/2

N2 - A preliminary analysis is presented concerning the use of EIT for detecting impedance inhomogeneities within the human brain. The work to date is centred around the monitoring of two distinct impedance variations: those associated with the application of a carotid clamp during surgery and changes caused by the redistribution of blood flow during auditory stimuli. Using the commercially available Ansoft Maxwell package, a 3D finite element model of the human head has been developed to solve the forward problem. The model is hemispherical in shape and comprises regions of brain, cerebrospinal fluid, skull and skin and includes 16 scalp electrodes each of area 1 cm2. Results from simulations using the model suggest that an EIT system, incorporating diametric current excitation, would require a voltage measurement sensitivity of 100-120 dB in order to detect the impedance variations in the above cases.

AB - A preliminary analysis is presented concerning the use of EIT for detecting impedance inhomogeneities within the human brain. The work to date is centred around the monitoring of two distinct impedance variations: those associated with the application of a carotid clamp during surgery and changes caused by the redistribution of blood flow during auditory stimuli. Using the commercially available Ansoft Maxwell package, a 3D finite element model of the human head has been developed to solve the forward problem. The model is hemispherical in shape and comprises regions of brain, cerebrospinal fluid, skull and skin and includes 16 scalp electrodes each of area 1 cm2. Results from simulations using the model suggest that an EIT system, incorporating diametric current excitation, would require a voltage measurement sensitivity of 100-120 dB in order to detect the impedance variations in the above cases.

KW - Brain

KW - Electrical impedance tomography

KW - Finite element

KW - Head

KW - Sensitivity

KW - Simulation

U2 - 10.1088/0967-3334/21/1/315

DO - 10.1088/0967-3334/21/1/315

M3 - Article

SN - 0967-3334

VL - 21

SP - 119

EP - 124

JO - Physiological Measurement

JF - Physiological Measurement

IS - 1

ER -

3D simulation of EIT for monitoring impedance variations within the human head

Abstract

Keywords

Access to Document

Fingerprint

Cite this