ANALYSIS OF 3-DIMENSIONAL SOFTWARE EIT PHANTOMS BY THE FINITE-ELEMENT METHOD

Date

1992-01-01

Author

Kuzuoğlu, Mustafa
IDER, YZ

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

179
views

0
downloads

In electrical impedance tomography, two-dimensional (2D) finite element solutions are used in the imaging algorithms. It is assumed that a major part of the current flowing through the object is restricted to the measurement plane (i.e. the plane determined by the electrodes which are used for measuring voltage differences) and the current flowing elsewhere is negligible. However, there is usually a three-dimensional (3D) variation of the conductivity distribution and if there are regions of high contrast close to the measurement plane, the measured voltage values may be considerably affected. In this work a 3D finite element analysis is utilised to demonstrate the previously mentioned effects. Examples are given to show the measured voltage differences for conductivity distributions which are identical on the measurement plane but different elsewhere.

Subject Keywords

Biophysics

URI

https://hdl.handle.net/11511/39005

Journal

CLINICAL PHYSICS AND PHYSIOLOGICAL MEASUREMENT

DOI

https://doi.org/10.1088/0143-0815/13/a/026

Collections

Department of Electrical and Electronics Engineering, Article

Suggestions

OpenMETU
Core

DETERMINATION OF THE BOUNDARY OF AN OBJECT INSERTED INTO A WATER-FILLED CYLINDER IDER, YZ; NAKIBOGLU, B; Kuzuoğlu, Mustafa; Gençer, Nevzat Güneri (IOP Publishing, 1992-01-01) In order to circumvent the electrode position determination problem in static electrical impedance tomography, it is possible to insert the object to be imaged into a water-filled cylinder on which the electrodes are at fixed and known positions. It has previously been shown that if the boundary of the internally placed object and the conductivity of the salty water in the cylinder are known, then a significant improvement in the conductivity image of the object is obtained. An algorithm for finding the bou...
Electrical impedance tomography using induced and injected currents Gençer, Nevzat Güneri; Kuzuoğlu, Mustafa (IOP Publishing, 1992-01-01) A two-dimensional forward problem formulation is introduced for electrical impedance tomography (EIT) using induced currents. The forward problem is linearised around a certain resistivity distribution and the inverse problem is formulated as a solution of a linear system of equations. Sensitivity of boundary measurements to resistivity variations arc analysed for spatially uniform, linear and quadratic fields. The formulation, however, is suitable for studying the effects of a general magnetic field applie...
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.
Design of tunable impedance matching circuit for a GSM antenna Öztürk, Mehmet Ali; Aydın Çivi, Hatice Özlem; Koçer, Fatih; Department of Electrical and Electronics Engineering (2015) In this thesis, automatic impedance matching circuits are designed by using several tuning approaches. A typical automatic impedance matching system compensates for the impedance variations of the antenna due to the human hand and head using an electronically tunable impedance matching circuitry. Maximum output power, the linearity and efficiency of PA can be improved using automatic impedance matching circuit units. There are various tunable impedance matching circuits proposed in the literature to enhance...
Approximate analytical solutions to the double-stance dynamics of the lossy spring-loaded inverted pendulum SHAHBAZI, Mohammad; Saranlı, Uluç; BABUSKA, Robert; LOPES, Gabriel A. D. (IOP Publishing, 2017-02-01) This paper introduces approximate time-domain solutions to the otherwise non-integrable double-stance dynamics of the 'bipedal' spring-loaded inverted pendulum (B-SLIP) in the presence of nonnegligible damping. We first introduce an auxiliary system whose behavior under certain conditions is approximately equivalent to the B-SLIP in double-stance. Then, we derive approximate solutions to the dynamics of the new system following two different methods: (i) updated-momentum approach that can deal with both the...

Citation Formats

M. Kuzuoğlu and Y. IDER, “ANALYSIS OF 3-DIMENSIONAL SOFTWARE EIT PHANTOMS BY THE FINITE-ELEMENT METHOD,” CLINICAL PHYSICS AND PHYSIOLOGICAL MEASUREMENT, pp. 135–138, 1992, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/39005.