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Electrodermal Imaging System (EDIS)
We are currently investigating the feasibility of a new body imaging technique based on skin surface electrical potentials and developing apparatus for this purpose.
It has been known for centuries that the body produces electrical voltages and that the potentials can be measured on the external surface. Many specialised electrophysiological diagnostic tests have been established for a long time and are routinely used in hospitals clinically to aid doctors in identifying what is happening in the heart (ECG), the brain (EEG) and various muscles (EMG). Other more specific electrical tests have also been developed and are regularly in clinical use.
All the clinical electrophysiological tests focus on a particular organ or entity and very often the voltage at a single location is measured and recorded for later analysis and diagnosis. At times a cluster of electrodes around a specific region is used to obtain the necessary data.
The new system and technique being explored is a mapping method, systematically measuring skin potentials at many points over the body and displaying the results as an image rather than the conventional graphical presentation encountered in the existing diagnostic tests.
The image below shows the results from a recent study of electrical activity measured on the front of a 55-year-old male subject. It was made with our third generation scanning system.
Distinguishable shapes are noticeable in areas, especially where one would expect the lungs to be.
Some electronic reference lines have been added to relate to selected anatomical features.
The voltage values are colour-coded to show areas having the same value.
There is some variation in raw voltage measurements that causes blurring; a degree of smoothing is applied to aid clarity.
This plot is based on a resolution of 10mm square.