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Electrical Impedance Tomography

Last modified: Fri Aug 3 07:59:57 2007

Electrical impedance tomography (EIT) was the subject of my PhD research. EIT (also called `applied potential tomography') is a technique for making tomographic images of the body using only the application and measurement of small electrical currents. The laboratory of which I was a member was involved in the application of electrical impedance tomography (EIT) to the imaging of brain activity. In 1992 we demonstrated for the first time that EIT may be used for imaging certain pathological brain processes (e.g., epilepsy) that are beyond the capabilities of other techniques. This achievement was reported as a `breakthrough' by the press at the time, but even now it would seem that more work is required before it is ready to be used on patients. My particular interest, however, was the use of EIT for imaging neuronal action-potential activity. If it could be done, this would represent a genuine breakthrough in our ability to study the brain. Imaging this activity is likely to be extremely difficult, and beyond the scope of any well-established imaging technique. Although I did not image action potentials during my PhD studies, I was able, by means of computer simulations, laboratory experiments and mathematical techniques, to get an idea of the characteristics that a suitable EIT system should have. Such a system cannot be implemented using existing technology, but may be possible in the future.

Although I am no longer involved in EIT research, I retain an interest in the subject and keep in contact with researchers still active in the field. Abstracts and, in some cases, full texts of some of the research papers I wrote in EIT can be found in the publications section of this site.

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