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US 5,311,878 AGranted
Real-time electrical impedance tomography system
AssigneeBritish Technology Group Limited
InventorsBrian H. Brown, David C. Barber
Life of this patent
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Abstract
A method of, and apparatus for, real-time imaging are described employing a plurality of contact electrodes (1) located for example around the thorax (2) with simultaneous measurement of potential between adjacent pairs of electrodes (1), digital demodulation of the potentials, and measurement and division of the drive current into the potential measurements before image reconstruction by the use of transputers (20, 22, 24 and 26).
Claims6
A method of real time imaging using electrical impedance tomography, comprising:
- a) arranging a plurality of pairs of surface electrodes at spaced apart locations around a body to be investigated;
- b) applying constant current drive to selected electrodes;
- c) measuring the resulting potentials between adjacent pairs of other electrodes;
- and
- d) forming images using an algorithm implemented as a single matrix multiplication of the measured data set with a matrix of weights, whereby the measurement noise is minimised by:
- (i) measuring potentials between adjacent pairs of said other electrodes simultaneously;
- (ii) de-modulating the potential measurement by digital signal processing, and
- (iii) measuring the drive current at the same time as the potentials, and dividing the drive current into potential measurements before image reconstruction.
5 more elements
Dependencies are inferred from the claim text.