Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
A quasi-static analysis for a class of induced-current EIT systems using discrete coils
Date
2002-06-01
Author
Koksal, A
Eyüboğlu, Behçet Murat
Demirbilek, M
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
140
views
0
downloads
Cite This
A discrete coil EIT system is investigated for the general case of an eccentric circular inhomogeneity. The solution methodology of the forward problem of this system is explained. An optimization procedure using this forward problem solution is developed to rind optimum currents that maximize the distinguishability. For an eccentric inhomogeneity problem, it is shown that the coil currents can be optimized to focus the current density in a region of interest. Optimum coil currents under limited peak coil currents constraint and limited total power constraint are obtained. Representative examples that demonstrate the performance of the system are presented.
Subject Keywords
Electrical and Electronic Engineering
,
Radiological and Ultrasound Technology
,
Software
,
Computer Science Applications
URI
https://hdl.handle.net/11511/36760
Journal
IEEE TRANSACTIONS ON MEDICAL IMAGING
DOI
https://doi.org/10.1109/tmi.2002.800603
Collections
Department of Electrical and Electronics Engineering, Article
Suggestions
OpenMETU
Core
Electrical conductivity imaging via contactless measurements
Gençer, Nevzat Güneri (Institute of Electrical and Electronics Engineers (IEEE), 1999-07-01)
A new imaging modality is introduced to image electrical conductivity of biological tissues via contactless measurements. This modality uses magnetic excitation to induce currents inside the body and measures the magnetic fields of the induced currents. In this study, the mathematical basis of the methodology is analyzed and numerical models are developed to simulate the imaging system. The induced currents are expressed using the (A) over right arrow-phi formulation of the electric field where (A) over rig...
The Sphere Packing Bound for DSPCs with Feedback à la Augustin
Nakiboğlu, Barış (Institute of Electrical and Electronics Engineers (IEEE), 2019-11-01)
Establishing the sphere packing bound for block codes on the discrete stationary product channels with feedback—which are commonly called the discrete memoryless channels with feedback—was considered to be an open problem until recently, notwithstanding the proof sketch provided by Augustin in 1978. A complete proof following Augustin’s proof sketch is presented to demonstrate its adequacy and to draw attention to two novel ideas that it employs. These novel ideas (i.e., the Augustin’s averaging and the use...
An advanced boundary element method (BEM) implementation for the forward problem of electromagnetic source imaging
Akahn-Acar, Z; Gençer, Nevzat Güneri (IOP Publishing, 2004-11-07)
The forward problem of electromagnetic source imaging has two components: a numerical model to solve the related integral equations and a model of the head geometry. This study is on the boundary element method (BEM) implementation for numerical solutions and realistic head modelling. The use of second-order (quadratic) isoparametric elements and the recursive integration technique increase the accuracy in the solutions. Two new formulations are developed for the calculation of the transfer matrices to obta...
Electrical conductivity Imaging via contactless measurements: An experimental study
KARBEYAZ, BAŞAK ÜLKER; Gençer, Nevzat Güneri (Institute of Electrical and Electronics Engineers (IEEE), 2003-05-01)
A data-acquisition system has been developed to image electrical conductivity of biological tissues via contactless measurements. This system uses magnetic excitation to induce currents inside the body and measures the resulting magnetic fields. The data-acquisition system is constructed using a PC-controlled lock-in amplifier instrument. A magnetically coupled differential coil is used to scan conducting phantoms by a computer controlled scanning system. A 10000-turn differential coil system with circular ...
Simple derivative-free nonlinear state observer for sensorless AC drives
Akin, Bilal; Orguner, Umut; Ersak, Aydin; Ehsani, Mehrdad (Institute of Electrical and Electronics Engineers (IEEE), 2006-10-01)
In this paper, a new Kalman filtering technique, unscented Kalman filter (UKF), is utilized both experimentally and theoretically as a state estimation tool in field-oriented control (FOC) of sensorless ac drives. Using the advantages of this recent derivative-free nonlinear estimation tool, rotor speed and dq-axis fluxes of an induction motor are estimated only with the sensed stator currents and voltages information. In order to compare the estimation performances of the extended Kalman filter (EKF) and U...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
A. Koksal, B. M. Eyüboğlu, and M. Demirbilek, “A quasi-static analysis for a class of induced-current EIT systems using discrete coils,”
IEEE TRANSACTIONS ON MEDICAL IMAGING
, pp. 688–694, 2002, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36760.