Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
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
Imaging anisotropic conductivity with induced current magnetic resonance electrical impedance tomography (ICMREIT)
Date
2018-06-27
Author
Eroğlu, Hasan Hüseyin
Sadighi, Mehdi
Eyüboğlu, Behçet Murat
Metadata
Show full item record
Item Usage Stats
157
views
0
downloads
Cite This
In gradient coil based induced current magnetic resonance electrical impedance tomography (ICMREIT), gradient coils of a conventional magnetic resonance imaging (MRI) scanner are excited with time varying waveforms embedded in an MRI pulse sequence [1], [2], [3]. As a result of the excitation, low frequency (LF) eddy current is induced in the volume conductor media being imaged which accumulates phase to MR signal. By measuring and post-processing the LF phase of the eddy current, LF conductivity images are reconstructed [1], [2], [3]. In [1], ICMREIT is experimentally realized with by excitation of the slice selection (z) gradient coil of a clinical MRI scanner and conductivity images of phantoms with isotropic conductivity are satisfactorily reconstructed. However, biological tissues have anisotropic conductivity distributions. In order to reconstruct anisotropic conductivity distributions, coils with linearly independent primary magnetic fields are required. In ICMREIT, phase encoding (y) gradient coil of an MRI scanner can also be used in addition to the z-gradient coil. In this study, we demonstrate numerical models including the z and y-gradient coils of an MRI scanner and a cylindrical volume conductor. We utilize distinguishability analysis in order to compare the abilities of z and y-gradient coil based ICMREIT systems to differentiate conductivity perturbations from the background [3]. We propose a conductivity image reconstruction algorithm and reconstruct conductivity images by using simulated and physical measurements obtained for a cylindrical volume conductor including an inhomogeneity. The results of the distinguishability analysis, the simulation and the experimental results show that utilizing the z-gradient coil is advantageous than using the y-gradient coil.
Subject Keywords
Induced current magnetic resonance electrical impedance tomography
,
Gradient coil
,
Distinguishability analysis
URI
http://icame.balikesir.edu.tr/ICAME18_Abstract_Book
https://hdl.handle.net/11511/75780
Conference Name
International Conference on Applied Mathematics in Engineering (ICAME), (June 27-29, 2018)
Collections
Department of Electrical and Electronics Engineering, Conference / Seminar
Suggestions
OpenMETU
Core
Induced Current Magnetic Resonance Electrical Conductivity Imaging With Oscillating Gradients
Eroglu, Hasan H.; Sadighi, Mehdi; Eyüboğlu, Behçet Murat (2018-07-01)
In this paper, induced current magnetic resonance electrical impedance tomography (ICMREIT) by means of current induction due to time-varying gradient fields of magnetic resonance imaging (MRI) systems is proposed. Eddy current and secondary magnetic flux density distributions are calculated for a numerical model composed of a z-gradient coil and a cylindrical conductor. An MRI pulse sequence is developed for the experimental evaluation of ICMREIT on a 3T MRI scanner. A relationship between the secondary ma...
Magnetic Resonance - Electrical Impedance Tomography (MR-EIT) Research at METU
Eyüboğlu, Behçet Murat (2006-09-01)
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...
Equipotential projection based magnetic resonance electrical impedance tomography (mr-eit) for high resolution conductivity imaging
Özdemir, Mahir Sinan; Eyüboğlu, Behçet Murat; Department of Electrical and Electronics Engineering (2003)
In this study, a direct reconstruction algorithm for Magnetic Resonance Electrical Impedance Tomography (MR-EIT) is proposed and experimentally implemented for high resolution true conductivity imaging. In MR-EIT, elec trical impedance tomography (EIT) and magnetic resonance imaging (MRI) are combined together. Current density measurements are obtained making use of Magnetic Resonance Current Density Imaging (MR-CDI) techniques and peripheral potential measurements are determined using conventional EIT tech...
Induced Current Magnetic Resonance Electrical Impedance Tomography with z-Gradient Coil
Eroglu, Hasan H.; Eyuboglu, Murat (2014-08-30)
Magnetic Resonance Electrical Impedance Tomography (MREIT) is a medical imaging method that provides images of electrical conductivity at low frequencies (0-1 kHz). In MREIT, electrical current is applied to the body via surface electrodes and corresponding magnetic flux density is measured by means of Magnetic Resonance (MR) phase imaging techniques. By utilizing the magnetic flux density measurements and surface potential measurements images of true conductivity distribution can be reconstructed. In order...
Distinguishability for Magnetic Resonance-Electric Impedance Tomography (MR-EIT)
Altunel, H.; Eyüboğlu, Behçet Murat; KÖKSAL, ADNAN (2006-09-01)
In magnetic resonance-electrical impedance tomography, magnetic flux density due to current injection is the measured quantity. Different conductivity distributions create different magnetic flux density distributions. Distinguishability for MR-EIT is defined using this fact. The definition is general and valid for 2D as well as 3D structures of any shape. It is not always possible to find an analytic expression for distinguishability. However, when a 2D cylindrical body with concentric inhomogeneity is con...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
H. H. Eroğlu, M. Sadighi, and B. M. Eyüboğlu, “Imaging anisotropic conductivity with induced current magnetic resonance electrical impedance tomography (ICMREIT),” presented at the International Conference on Applied Mathematics in Engineering (ICAME), (June 27-29, 2018), Balıkesir, Türkiye, 2018, Accessed: 00, 2021. [Online]. Available: http://icame.balikesir.edu.tr/ICAME18_Abstract_Book.
