Bi-frequency symmetry difference electrical impedance tomography-a novel technique for perturbation detection in static scenes

Physiological Measurement
Barry McDermottEmily Porter

Abstract

A novel method for the imaging of static scenes using electrical impedance tomography (EIT) is reported with implementation and validation using numerical and phantom models. The technique is applicable to regions featuring symmetry in the normal case, asymmetry in the presence of a perturbation, and where there is a known, frequency-dependent change in the electrical conductivity of the materials in the region. The stroke diagnostic problem is used as a motivating sample application. The head is largely symmetrical across the sagittal plane. A haemorrhagic or ischaemic lesion located away from the sagittal plane will alter this natural symmetry, resulting in a symmetrical imbalance that can be detected using EIT. Specifically, application of EIT stimulation and measurement protocols at two distinct frequencies detects deviations in symmetry if an asymmetrically positioned lesion is present, with subsequent identification and localisation of the perturbation based on known frequency-dependent conductivity changes. Anatomically accurate computational models are used to demonstrate the feasibility of the proposed technique using different types, sizes, and locations of lesions with frequency-dependent (or independent) conductivit...Continue Reading

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Mar 14, 2018·Physiological Measurement·Barry McDermottMartin O'Halloran
May 17, 2018·Proceedings of the National Academy of Sciences of the United States of America·Xiang-Zhen KongClyde Francks

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Citations

Nov 5, 2019·Physiological Measurement·Richard Bayford, Nick Polydorides

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