| Electrical Resistance Tomography |
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| CATEGORIES ABOUT ELECTRICAL RESISTANCE TOMOGRAPHY | |
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Electrical resistance tomography (ERT) is a way of building an image of the internal electrical structure of an object. It determines the structure of Electrical Conductivity of an object by taking measurements on its exterior. It is also known as Electrical Resistivity Tomography in geophysics and Electrical Impedance Tomography in medical imaging. HOW IT WORKS A number of electrode pairs are placed on the surface of the object and low frequency electrical currents are 'injected' into the sub-surface, and then measurements are taken of the potential distribution that these currents establish. A complete picture can be built up by using different orientations of emmiter and receiver electrodes. From the data, a computer uses numerical solutions to Inverse Problem s to model the electrical-resistivity distribution. ERT was conceived by people in both of its applicable fields independently: by William Henderson and Daniel Webster in 1978 as a medical imaging modality and by Lytle and Dines in 1978 as a geophysical imaging tool {Link without Title} . The structure of a typical ERT system is composed of three main parts: sensors, data acquisition system and image reconstruction system/host computer. |
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