A dual-frequency electrical impedance tomography system
- 1 October 1989
- journal article
- research article
- Published by IOP Publishing in Physics in Medicine & Biology
- Vol. 34 (10), 1465-1476
- https://doi.org/10.1088/0031-9155/34/10/009
Abstract
An electrical impedance tomography (EIT) system has been constructed, operating at two frequencies, 40.96 and 81.92 kHz, for investigating the practicability of the dual-frequency imaging method discussed theoretically in a previous paper (Griffiths and Ahmed, 1987). For testing the system, a phantom with a frequency-dependent electrical conductivity was designed. The properties of the phantom can be adjusted to match the frequency dependence observed in a given type of tissue. Dual-frequency images were obtained from a phantom simulating liver and also from 200 g of porcine liver in a saline tank. Prior to image reconstruction, it was necessary to apply a correction to the data to cancel the effects of stray capacitance within the electronics.This publication has 17 references indexed in Scilit:
- Applied potential tomography: a new technique for monitoring pulmonary functionClinical Physics and Physiological Measurement, 1988
- An assessment of dynamic images by applied potential tomography for monitoring pulmonary perfusionClinical Physics and Physiological Measurement, 1988
- Three-dimensional reconstruction in electrical impedance tomographyClinical Physics and Physiological Measurement, 1988
- An evaluation of applied potential tomography in the diagnosis of infantile hypertrophic pyloric stenosisClinical Physics and Physiological Measurement, 1988
- A dual-frequency applied potential tomography technique: computer simulationsClinical Physics and Physiological Measurement, 1987
- Applied potential tomography for non-invasive temperature mapping in hyperthermiaClinical Physics and Physiological Measurement, 1987
- The importance of phase measurement in electrical impedance tomographyPhysics in Medicine & Biology, 1987
- Dielectric properties of low-water-content tissuesPhysics in Medicine & Biology, 1985
- Imaging spatial distributions of resistivity using applied potential tomographyElectronics Letters, 1983
- The specific resistance of biological material—A compendium of data for the biomedical engineer and physiologistMedical & Biological Engineering & Computing, 1967