Magnetic resonance - electrical impedance tomography

2006-01-01
WILEY - Encyclopedia of Biomedical Engineering

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Following development of magnetic resonance current density imaging (MRCDI), magnetic resonance - electrical impedance tomography (MR-EIT) has emerged as a promising approach to produce high resolution conductivity images. Electric current applied to a conductor results in a potential field and a magnetic flux density distribution. Using a magnetic resonance imaging (MRI) system, the magnetic flux density distribution can be reconstructed as in MRCDI. The flux density is related to the current density distr...
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The advent of large arrays of superconducting magnetic field sensors makes it possible to properly sample the topography of the magnetic field pattern across the human scalp with a temporal resolution of a few milliseconds. These capabilities can be exploited for computing a best estimate of the spatiotemporal evolution of electrical currents within coherently active neural populations distributed across the cerebral cortex. Data from 200 sensors can be interpreted by the method of singular value decomposit...
ELECTRICAL-IMPEDANCE TOMOGRAPHY USING INDUCED CURRENTS - AN EXPERIMENTAL-STUDY
Gençer, Nevzat Güneri (1993-11-06)
The theory behind induced current EIT is summarized. A prototype data acquisition system is described which is realized to verify the theoretical studies. Data collected from a two-dimensional (2D) object distribution is compared with the calculated data obtained by the finite element method. It is shown that the data acquisition system is capable of collecting real data which closely follows the theoretically expected perturbation in boundary potential differences. Images reconstructed by real data sets ar...
Citation Formats
B. M. Eyüboğlu, “Magnetic resonance - electrical impedance tomography,” WILEY - Encyclopedia of Biomedical Engineering, pp. 2154–2162, 2006, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/83721.