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A numerical study on conductivity estimation of the human head in the low frequency domain using induced current MR phase imaging EIT with multiple gradients

Nele De Geeter (UGent) , Guillaume Crevecoeur (UGent) and Luc Dupré (UGent)
(2013) IEEE TRANSACTIONS ON MAGNETICS. 49(9). p.5004-5010
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Abstract
An accurate conductivity estimation of the human brain tissues is important for the correct diagnosis and therapy of neurological diseases. These values are patient-specific and vary naturally with the frequency. Nevertheless, they are often approximated by a constant value. Induced current magnetic resonance - electrical impedance tomography (ICMR-EIT) is a possible technique for non-invasive conductivity reconstruction in the low frequency domain. This paper presents a novel ICMR-EIT based method that uses the difference of two MR phase images. These images are obtained by gradient echo sequences with and without switching an eddy-current induction gradient. We propose the use of multiple gradients with different time periods, so that only a single parameter per tissue needs to be estimated with conservation of the frequency dependence. A numerical study on a spherical head model with four tissues investigates the feasibility of estimating conductivity values and shows that the proposed technique can successfully reconstruct these conductivity values. Furthermore, the influence of the material model and the number of harmonics associated to the gradient is investigated, together with performance of the proposed technique in the presence of noise.
Keywords
induced current magnetic resonance-electrical impedance tomography (ICMR-EIT), human head, gradient echo sequence, Conductivity, MODEL, TISSUES, ELECTRICAL-IMPEDANCE TOMOGRAPHY, GEL DOSIMETRY, TRANSCRANIAL MAGNETIC STIMULATION, SIMULATION, phase image

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MLA
De Geeter, Nele, Guillaume Crevecoeur, and Luc Dupré. “A Numerical Study on Conductivity Estimation of the Human Head in the Low Frequency Domain Using Induced Current MR Phase Imaging EIT with Multiple Gradients.” IEEE TRANSACTIONS ON MAGNETICS 49.9 (2013): 5004–5010. Print.
APA
De Geeter, N., Crevecoeur, G., & Dupré, L. (2013). A numerical study on conductivity estimation of the human head in the low frequency domain using induced current MR phase imaging EIT with multiple gradients. IEEE TRANSACTIONS ON MAGNETICS, 49(9), 5004–5010.
Chicago author-date
De Geeter, Nele, Guillaume Crevecoeur, and Luc Dupré. 2013. “A Numerical Study on Conductivity Estimation of the Human Head in the Low Frequency Domain Using Induced Current MR Phase Imaging EIT with Multiple Gradients.” Ieee Transactions on Magnetics 49 (9): 5004–5010.
Chicago author-date (all authors)
De Geeter, Nele, Guillaume Crevecoeur, and Luc Dupré. 2013. “A Numerical Study on Conductivity Estimation of the Human Head in the Low Frequency Domain Using Induced Current MR Phase Imaging EIT with Multiple Gradients.” Ieee Transactions on Magnetics 49 (9): 5004–5010.
Vancouver
1.
De Geeter N, Crevecoeur G, Dupré L. A numerical study on conductivity estimation of the human head in the low frequency domain using induced current MR phase imaging EIT with multiple gradients. IEEE TRANSACTIONS ON MAGNETICS. 2013;49(9):5004–10.
IEEE
[1]
N. De Geeter, G. Crevecoeur, and L. Dupré, “A numerical study on conductivity estimation of the human head in the low frequency domain using induced current MR phase imaging EIT with multiple gradients,” IEEE TRANSACTIONS ON MAGNETICS, vol. 49, no. 9, pp. 5004–5010, 2013.
@article{3035619,
  abstract     = {An accurate conductivity estimation of the human brain tissues is important for the correct diagnosis and therapy of neurological diseases. These values are patient-specific and vary naturally with the frequency. Nevertheless, they are often approximated by a constant value. Induced current magnetic resonance - electrical impedance tomography (ICMR-EIT) is a possible technique for non-invasive conductivity reconstruction in the low frequency domain. This paper presents a novel ICMR-EIT based method that uses the difference of two MR phase images. These images are obtained by gradient echo sequences with and without switching an eddy-current induction gradient. We propose the use of multiple gradients with different time periods, so that only a single parameter per tissue needs to be estimated with conservation of the frequency dependence. A numerical study on a spherical head model with four tissues investigates the feasibility of estimating conductivity values and shows that the proposed technique can successfully reconstruct these conductivity values. Furthermore, the influence of the material model and the number of harmonics associated to the gradient is investigated, together with performance of the proposed technique in the presence of noise.},
  author       = {De Geeter, Nele and Crevecoeur, Guillaume and Dupré, Luc},
  issn         = {0018-9464},
  journal      = {IEEE TRANSACTIONS ON MAGNETICS},
  keywords     = {induced current magnetic resonance-electrical impedance tomography (ICMR-EIT),human head,gradient echo sequence,Conductivity,MODEL,TISSUES,ELECTRICAL-IMPEDANCE TOMOGRAPHY,GEL DOSIMETRY,TRANSCRANIAL MAGNETIC STIMULATION,SIMULATION,phase image},
  language     = {eng},
  number       = {9},
  pages        = {5004--5010},
  title        = {A numerical study on conductivity estimation of the human head in the low frequency domain using induced current MR phase imaging EIT with multiple gradients},
  url          = {http://dx.doi.org/10.1109/TMAG.2013.2250985},
  volume       = {49},
  year         = {2013},
}

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