Current Density Impedance Imaging

Current density impedance imaging (CDII) is a new impedance imaging technique that can noninvasively measure the conductivity distribution inside a medium. It utilizes current density vector measurements which can be made using a magnetic resonance imager (MRI) (Scott et al., 1991). CDII is based on...

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Bibliographic Details
Published in:IEEE transactions on medical imaging 2008-09, Vol.27 (9), p.1301-1309
Main Authors: Hasanov, K.F., Ma, A.W., Nachman, A.I., Joy, M.L.G.
Format: Article
Language:English
Subjects:
Algorithms
Animals
Computer Simulation
Conductivity measurement
Current density
Current measurement
Density measurement
Diagnostic Imaging - instrumentation
Diagnostic Imaging - methods
Electric Impedance
electrical
Humans
Image Enhancement - methods
Image Interpretation, Computer-Assisted - methods
imaging
Imaging phantoms
impedance
Impedance measurement
magnetic
Magnetic resonance
Magnetic resonance imaging
Models, Biological
Performance evaluation
Phantoms, Imaging
Plethysmography, Impedance - instrumentation
Plethysmography, Impedance - methods
Reproducibility of Results
resonance
Sensitivity and Specificity
Testing
tomography
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Summary:Current density impedance imaging (CDII) is a new impedance imaging technique that can noninvasively measure the conductivity distribution inside a medium. It utilizes current density vector measurements which can be made using a magnetic resonance imager (MRI) (Scott et al., 1991). CDII is based on a simple mathematical expression for nablasigma/sigma = nabla ln sigma, the gradient of the logarithm of the conductivity sigma, at each point in a region where two current density vectors J 1 and J 2 have been measured and J 1 x J 2 ne 0. From the calculated nabla In sigma and a priori knowledge of the conductivity at the boundary, the logarithm of the conductivity In sigma is integrated by two different methods to produce an image of the conductivity sigma in the region of interest. The CDII technique was tested on three different conductivity phantoms. Much emphasis has been placed on the experimental validation of CDII results against direct bench measurements by commercial LCR meters before and after CDII was performed.
ISSN:0278-0062
1558-254X
DOI:10.1109/TMI.2008.922691