Electrical impedance tomography
First Claim
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1. A method of data collection for use in the construction of a tomographic image of a body comprising:
- placing a plurality of electrodes adjacent the surface of the body at spaced intervals on the body;
applying, in successive manner through the electrodes, an electrical input signal to at least one electrode pair to generate a potential difference between other electrode pairs; and
measuring, at the said other electrode pairs and at each stage of the successive application of input signal, output signals representing an electrical characteristic of that body subjected to each applied input signal, wherein the measurements are made over varying periods of time.
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Abstract
To improve the reliability of the image or to selectively enhance parts of the image produced by way of a tomographic technique such as electrical impedance tomography (EIT), also known as applied potential tomography (APT), the method and apparatus of the invention provides that the electrical signal measurements be made over varying periods of time. The manner of variation can be related to the relative positions of drive and receive electrode pairs or to the output signal size, either as theoretically expected or as actually measured. The invention can be applied to serial or to parallel data collection techniques.
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8 Claims
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1. A method of data collection for use in the construction of a tomographic image of a body comprising:
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placing a plurality of electrodes adjacent the surface of the body at spaced intervals on the body; applying, in successive manner through the electrodes, an electrical input signal to at least one electrode pair to generate a potential difference between other electrode pairs; and measuring, at the said other electrode pairs and at each stage of the successive application of input signal, output signals representing an electrical characteristic of that body subjected to each applied input signal, wherein the measurements are made over varying periods of time. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Apparatus for data collection for use in the construction of a tomographic image of a body comprising:
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a plurality of electrodes applicable adjacent the surface of the body at spaced intervals on the body; means for applying, in successive manner through the electrodes, an electrical input signal to at least one electrode pair to generate a potential difference between the other electrode pairs; and means for measuring, at the other electrode pairs and at each stage of the successive application of the input signal, output signals representing an electrical characteristic of the body subjected to each respective applied input signal, wherein said means for measuring comprises means for varying the periods of time over which the measurements are made.
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Specification