Induced Current Magnetic Resonance Electrical Impedance Tomography with z-Gradient Coil

Date

2014-08-30

Author

Eroglu, Hasan H.
Eyuboglu, Murat

Metadata

Show full item record

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

Item Usage Stats

185
views

0
downloads

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 to overcome difficulties regarding current application via surface electrodes, Induced Current MREIT (ICMREIT) have been proposed in the past. In ICMREIT, electrical currents and corresponding magnetic flux density are generated in the object through electromagnetic induction by means of externally placed coils driven with time varying currents. In this study, use of z-gradient, z-Helmholtz, and circular coil configurations in ICMREIT are proposed and investigated. Finite Element Method (FEM) is used to solve the forward problem of ICMREIT. Consequently, excitation performances and clinical applicability of different coil configurations are analyzed.

Subject Keywords

Coils, Magnetic resonance imaging, Conductivity, Conductors, Tomography, Finite element analysis, Magnetic resonance

URI

https://hdl.handle.net/11511/65310

Conference Name

36th Annual International Conference of the IEEE-Engineering-in-Medicine-and-Biology-Society (EMBC)

Collections

Department of Electrical and Electronics Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Anisotropic Conductivity Imaging with MREIT Using J-substitution and Hybrid J-substitution Algorithms Degirmenci, E.; Eyüboğlu, Behçet Murat (2009-09-12) Magnetic Resonance Electrical Impedance Tomography (MREIT) is a tomographical imaging technique which uses measurements of magnetic flux density induced by a probing current to reconstruct electrical conductivity distribution within a conductor object with magnetic resonance active nuclei. In this study, two novel anisotropic conductivity reconstruction algorithms for MREIT are proposed. The technique is evaluated with simulated measurements.
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...
Induced current magnetic resonance electrical impedance tomography (ICMREIT) with low frequency switching of gradient fields Eroğlu, Hasan Hüseyin; Eyüboğlu, Behçet Murat; Department of Electrical and Electronics Engineering (2017) In this thesis, it is aimed to investigate induced current magnetic resonance electrical impedance tomography (ICMREIT) starting from modeling and analysis to experimental validation. Forward and inverse problems of ICMREIT are formulated. A magnetic resonance imaging (MRI) pulse sequence is proposed for the realization of ICMREIT using the slice selection (z) gradient coil of MRI scanners. Considering the proposed MRI pulse sequence, relationship between the low frequency (LF) MR phase and the secondary ma...
RF Coil Design for MRI Applications in Inhomogeneous Main Magnetic Fields Yılmaz, Ayşen; Eyueboglu, B. M. (2006-09-01) Conventional Magnetic Resonance Imaging (MRI) techniques require homogeneous main magnetic fields. However, MRI applications that are executed in inhomogenous main magnetic fields have been developed in recent years. In this study, RF coil geometries are designed for MRI applications in inhomogeneous magnetic fields. Method of moments is used to obtain the current density distribution on a predefined surface that can produce a desired magnetic field, which is perpendicular to the given inhomogenous main mag...
Magnetic Resonance Electrical Impedance Tomography For Anisotropic Conductivity Imaging Degirmenci, E.; Eyüboğlu, Behçet Murat (2008-11-27) Magnetic Resonance Electrical Impedance Tomography (MREIT) brings high resolution imaging of true conductivity distribution to reality. MREIT images are reconstructed based on measurements of current density distribution and a surface potential value, induced by an externally applied current flow. Since biological tissues may be anisotropic, isotropic conductivity assumption, as it is adopted in most of MREIT reconstruction algorithms, introduces reconstruction inaccuracy. In this study, a novel algorithm i...

Citation Formats

H. H. Eroglu and M. Eyuboglu, “Induced Current Magnetic Resonance Electrical Impedance Tomography with z-Gradient Coil,” Chicago, IL, 2014, p. 1143, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/65310.