Experimental results for 2D magnetic resonance electrical impedance tomography (MR-EIT) using magnetic flux density in one direction

Date
2003
Authors
Birgül, Ö.
Eyüboğlu, B. M.
İder, Y. Z.
Advisor
Supervisor
Co-Advisor
Co-Supervisor
Instructor
Source Title
Physics in Medicine and Biology
Print ISSN
0031-9155
Electronic ISSN
Publisher
Institute of Physics Publishing
Volume
48
Issue
21
Pages
3485 - 3504
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Series
Abstract

Magnetic resonance electrical impedance tomography (MR-EIT) is an emerging imaging technique that reconstructs conductivity images using magnetic flux density measurements acquired employing MRI together with conventional EIT measurements. In this study, experimental MR-EIT images from phantoms with conducting and insulator objects are presented. The technique is implemented using the 0.15 T Middle East Technical University MRI system. The dc current method used in magnetic resonance current density imaging is adopted. A reconstruction algorithm based on the sensitivity matrix relation between conductivity and only one component of magnetic flux distribution is used. Therefore, the requirement for object rotation is eliminated. Once the relative conductivity distribution is found, it is scaled using the peripheral voltage measurements to obtain the absolute conductivity distribution. Images of several insulator and conductor objects in saline filled phantoms are reconstructed. The L2 norm of relative error in conductivity values is found to be 13%, 17% and 14% for three different conductivity distributions.

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Keywords
Current density, Electric conductivity, Electric conductors, Electric insulators, Electric potential, Magnetic flux, Magnetic resonance, Magnetic resonance imaging, Magnetic impedance, Electric impedance tomography, Sodium chloride, Algorithm, Analytical error, Calculation, Controlled study, Density, Electric current, Electric potential, Finite element analysis, Image reconstruction, Impedance, Magnetic field, Measurement, Nuclear magnetic resonance imaging, Sensitivity analysis, Signal noise ratio, Tomography, Electric Impedance, Image Enhancement, Reproducibility of Results, Sensitivity and Specificity
Citation
Published Version (Please cite this version)