Biomedical applications of electrical impedance tomography: a critical review, D.S. Holder and B.H. Brown review of EIT systems available for medical use, Brian Brown an overview of image reconstruction, D.C. Barber in-vivo impedance images using sinusoidal current patterns, J.C. Newell, D. Isaacson, M. Cheney.

t. This paper surveys some of the work our group has done in electrical impedance tomography.

Clinical and Physiological Applications of Electrical Impedance Tomography

Electrical Impedance Tomography

We review theoretical and numerical studies of the inverse problem of electrical impedance tomography which seeks the electrical conductivity and permittivity inside a body, given simultaneous measurements of electrical currents and potentials at the boundary.

/pdf/electrical-impedance-tomography-3po2ct3t0v.pdf

Electrical impedance tomography

Electrical impedance tomography (EIT) has been the subject of quite intensive research for about 20 years but has yet to become established as a routine tool in healthcare. None the less the volume of published research work in this area is still rising. This review takes a broad look at what has been achieved and attempts to give the reader sufficient information to form an opinion as to the likely future for this interesting area of research.

Electrical impedance tomography (EIT): a review

A magnetic induction tomography (MIT) apparatus comprises an excitation signal generator (70) for generating an excitation signal; a primary excitation coil (50) arranged to receive the excitation signal from the excitation signal generator (70) and to convert the excitation signal into electromagnetic radiation and to emit said radiation to excite a sample having at least one of an electrical conductivity distribution, an electrical permittivity distribution or a magnetic permeability distribution; a primary receiver coil (60) arranged to receive electromagnetic radiation from the excited sample and to convert the received radiation into a detection signal; and a signal distribution network (115) arranged to receive the detection signal from the primary receiver coil (60). The apparatus further comprises a passive reference detector arranged to detect the excitation signal and to convert the detected signal into a passive reference signal. The apparatus further comprises an active reference signal generator (230) for generating an active reference signal; and an active reference source (175) arranged to receive the active reference signal from the active reference signal generator (230) and to supply the active reference signal to the signal distribution network (115).

https://iopscience.iop.org/article/10.1088/0957-0233/12/8/319/pdf

Magnetic induction tomography

Imbalances in regional lung ventilation, with gravity-dependent collapse and overdistention of nondependent zones, are likely associated to ventilator-induced lung injury Electric impedance tomography is a new imaging technique that is potentially capable of monitoring those imbalances The aim of this study was to validate electrical impedance tomography measurements of ventilation distribution, by comparison with dynamic computerized tomography in a heterogeneous population of critically ill patients under mechanical ventilation Multiple scans with both devices were collected during slow-inflation breaths Six repeated breaths were monitored by impedance tomography, showing acceptable reproducibility We observed acceptable agreement between both technologies in detecting right-left ventilation imbalances (bias = 0% and limits of agreement = -10 to +10%) Relative distribution of ventilation into regions or layers representing one-fourth of the thoracic section could also be assessed with good precision Depending on electrode positioning, impedance tomography slightly overestimated ventilation imbalances along gravitational axis Ventilation was gravitationally dependent in all patients, with some transient blockages in dependent regions synchronously detected by both scanning techniques Among variables derived from computerized tomography, changes in absolute air content best explained the integral of impedance changes inside regions of interest (r(2) > or = 092) Impedance tomography can reliably assess ventilation distribution during mechanical ventilation

https://www.atsjournals.org/doi/pdf/10.1164/rccm.200301-133OC

Clinical and Physiological Applications of Electrical Impedance Tomography

Citations

Electrical Impedance Tomography

Electrical impedance tomography

Electrical impedance tomography (EIT): a review

Magnetic induction tomography

Imbalances in regional lung ventilation: a validation study on electrical impedance tomography.