DETERMINATION OF OPTIMUM INJECTED CURRENT PATTERNS IN ELECTRICAL-IMPEDANCE TOMOGRAPHY

Date

1995-08-01

Author

KOKSAL, A
Eyüboğlu, Behçet Murat

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The problem of finding the optimum current under different constraints in electrical impedance tomography is cast into a non-linear optimization problem. Optimum currents are investigated for a two-dimensional cylindrical body with a concentric or an eccentric inhomogeneity under the constraints of constant dissipated power and constant total injected current. For a concentric inhomogeneity, it is shown that the opposite drive results in a better distinguishability than the cosine current pattern under the constant-injected-current constraint. The results for the concentric case are extended to the eccentric case directly using the properties of the conformal transformation and of the constraints involved. Distinguishability and the minimum detectable object size achieved by the optimized currents are compared with the ones achieved by the cosine current pattern for conductivity distributions with the concentric and eccentric inhomogeneity.

Subject Keywords

Biophysics, Physiology (medical), Physiology, Biomedical Engineering

URI

https://hdl.handle.net/11511/41531

Journal

PHYSIOLOGICAL MEASUREMENT

DOI

https://doi.org/10.1088/0967-3334/16/3a/010

Collections

Department of Electrical and Electronics Engineering, Article

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ANALYTIC AND SEMIANALYTIC SOLUTIONS IN ELECTRICAL-IMPEDANCE TOMOGRAPHY .2. 3-DIMENSIONAL PROBLEMS PIDCOCK, MK; KUZUOGLU, M; Leblebicioğlu, Mehmet Kemal (IOP Publishing, 1995-05-01) We give analytic and semi-analytic solutions to a number of problems which are related to the image reconstruction problem of electrical impedance tomography (EIT) in three dimensions.
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A METHOD FOR COMPARATIVE-EVALUATION OF EIT ALGORITHMS USING A STANDARD DATA SET IDER, YZ; EYUBOGLU, BM; KUZUOGLU, M; Leblebicioğlu, Mehmet Kemal; BAYSAL, U; CAGLAR, BK; BIRGUL, O (IOP Publishing, 1995-08-01) The point spread function (PSF) is the most widely used tool for quantifying the spatial resolution of imaging systems. However, prerequisites for the proper use of this tool are linearity and space invariance. Because EIT is non-linear it is only possible to compare different reconstruction algorithms using a standard data set. In this study, the FEM is used to generate simulation data, which are used to investigate the non-linear behaviour of EIT, the space dependence of its PSF and its capability of reso...
Two alternatives for magnetic resonance electrical impedance tomography: injected or induced current Eroglu, Hasan H.; Eyüboğlu, Behçet Murat (IOP Publishing, 2016-11-01) In this paper, the abilities of injected current magnetic resonance electrical impedance tomography (MREIT) and induced current magnetic resonance electrical impedance tomography (ICMREIT) systems to differentiate a conductivity perturbation from an otherwise uniform conductivity distribution are compared. The sensitivity of MREIT measurements changes as a function of distance to the electrodes used for current injection. The sensitivity of ICMREIT measurements is related to the radial location, being a min...

Citation Formats

A. KOKSAL and B. M. Eyüboğlu, “DETERMINATION OF OPTIMUM INJECTED CURRENT PATTERNS IN ELECTRICAL-IMPEDANCE TOMOGRAPHY,” PHYSIOLOGICAL MEASUREMENT, pp. 0–0, 1995, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41531.