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(2005 / vol.8 / no.2)
Electrical Conductivity Imaging using Magnetic resonance electrical impedance tomography (MREIT)}
Jin Keun Seo, Ohin Kwon, Eung Je Woo
Pages. 129-152     



Magnetic Resonance Electrical Impedance Tomography (MREIT) is a new
medical imaging modality providing high resolution static
conductivity images based on the current injection MRI technique.
MREIT was motivated to deal with the well-known severe ill-posedness
of the image reconstruction problem in Electrical Impedance
Tomography (EIT). In order to bypass the ill-posed nature in EIT,
MREIT takes advantage of an MRI scanner as a tool to capture partial
information about magnetic flux density due to internal current
density. The conductivity distribution have an effect in change in
internal current density pathways that are interrelated with the
unknown conductivity distribution. Lately, we have made a
significant progress in reconstruction algorithms in MREIT.
Experimental MREIT study demonstrates that the reconstructed
conductivity image distinguishes different biological tissues in
terms of both their shapes and conductivity values. Reconstructed
static conductivity images will allow us to obtain internal current
density images for any arbitrary injection current and electrode
configuration. Very recently, we also initiated a method of
reconstructing anisotropic conductivity images.



1. Introduction
2. Motivation
3. EIT and its limitation
4. Basic idea of MREIT
5. Mathematical formulation of MREIT
6. MREIT image reconstruction techniques
7. Measurement techniques in MREIT
8. Progress in MREIT images
9. Conclusions and Outlook