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      • Department of Electrical and Electronics Engineering
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      Experimental results for 2D magnetic resonance electrical impedance tomography (MR-EIT) using magnetic flux density in one direction

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      Author(s)
      Birgül, Ö.
      Eyüboğlu, B. M.
      İder, Y. Z.
      Date
      2003
      Source Title
      Physics in Medicine and Biology
      Print ISSN
      0031-9155
      Publisher
      Institute of Physics Publishing
      Volume
      48
      Issue
      21
      Pages
      3485 - 3504
      Language
      English
      Type
      Article
      Item Usage Stats
      249
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      278
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      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.
      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
      Permalink
      http://hdl.handle.net/11693/24405
      Published Version (Please cite this version)
      http://dx.doi.org/10.1088/0031-9155/48/21/003
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      • Department of Electrical and Electronics Engineering 3868
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