Paper Info
Title
Local Harmonic B-Z Algorithm With Domain Decomposition In Mreit: Computer Simulation Study
Abstract
Magnetic resonance electrical impedance tomography (MREIT) attempts to provide conductivity images of an electrically conducting object with a high spatial resolution. When we inject current into the object, it produces internal distributions of current density J and magnetic flux density B = (B-x, B-y, B-z). By using a magnetic resonance imaging (MRI) scanner, we can measure B-z data where z is the direction of the main magnetic field of the scanner. Conductivity images are reconstructed based on the relation between the injection current and B-z data. The harmonic B-z algorithm was the first constructive MREIT imaging method and it has been quite successful in previous numerical and experimental studies. Its performance is, however, degraded when the imaging object contains low-conductivity regions such as bones and lungs. To overcome this difficulty, we carefully analyzed the structure of a current density distribution near such problematic regions and proposed a new technique, called the local harmonic B-z algorithm. We first reconstruct conductivity values in local regions with a low conductivity contrast, separated from those problematic regions. Then, the method of characteristics is employed to find conductivity values in the problematic regions. One of the most interesting observations of the new algorithm is that it can provide a scaled conductivity image in a local region without knowing conductivity values outside the region. We present the performance of the new algorithm by using computer simulation methods.
Year
DOI
Venue
2008
10.1109/TMI.2008.926055
IEEE TRANSACTIONS ON MEDICAL IMAGING
Keywords
DocType
Volume
Conductivity image, domain decomposition, harmonic B-z, magnetic resonance electrical impedance tomography (MREIT)
Journal
27
Issue
ISSN
Citations 
12
0278-0062
0
PageRank 
References 
Authors
0.34
5
7
Name
Order
Citations
PageRank
Jin Keun Seo137658.65
Sung Wan Kim200.34
Sungwhan Kim3247.13
Jijun Liu4299.16
Eung Je Woo526472.69
Kiwan Jeon6133.72
Chang-Ock Lee77816.91