Document Detail


Experimental verification of contrast mechanism in Magnetic Resonance Electrical Impedance Tomography (MREIT).
MedLine Citation:
PMID:  21096679     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Magnetic Resonance Electrical Impedance Tomography (MREIT) aims to produce cross-sectional images of a conductivity distribution inside the human body with a spatial resolution of a few millimeters. Injecting currents into an imaging object at different directions, we measure induced internal magnetic flux densities using an MRI scanner. Conductivity images are reconstructed based on the relation between the induced magnetic flux density and conductivity. Though there have been theoretical and experimental MREIT studies to explain and validate its imaging method, understanding the contrast mechanism in MREIT could be difficult due to the complexity in associated mathematical expressions. In this paper, we explain the contrast mechanism by performing and analyzing a series of imaging experiments of stable conductivity phantoms. Placing a thin and hollow cylinder with holes around its side inside a saline tank, we could construct a conductivity phantom with a stable conductivity contrast between two regions inside and outside the cylinder. Images of induced magnetic flux densities show ramp structures of which slopes are determined by conductivity contrasts. From the experimental results, we summarize the contrast mechanism in MREIT for better designs of MREIT pulse sequences and data processing methods.
Authors:
Young Tae Kim; Tong In Oh; Eung Je Woo
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Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference     Volume:  2010     ISSN:  1557-170X     ISO Abbreviation:  Conf Proc IEEE Eng Med Biol Soc     Publication Date:  2010  
Date Detail:
Created Date:  2010-11-24     Completed Date:  2011-03-29     Revised Date:  2014-08-21    
Medline Journal Info:
Nlm Unique ID:  101243413     Medline TA:  Conf Proc IEEE Eng Med Biol Soc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4987-90     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Dielectric Spectroscopy / instrumentation,  methods*
Image Enhancement / instrumentation,  methods*
Magnetic Resonance Imaging / instrumentation,  methods*
Phantoms, Imaging
Reproducibility of Results
Sensitivity and Specificity
Tomography / instrumentation,  methods*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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