Magnetic Resonance Electrical Impedance Tomography (MREIT).
SIAM Review 01/2011; 53:40-68. DOI:10.1137/080742932
Conference Proceeding: Feasibility of dual-frequency conductivity imaging using MREIT and MREPT[show abstract] [hide abstract]
ABSTRACT: Magnetic resonance electrical impedance tomography (MREIT) and magnetic resonance electrical property tomography (MREPT) are new medical imaging modalities capable of visualizing distributions of electrical properties inside an electrically conducting object such as the human body. MREIT provides conductivity images at frequencies below a few kHz by processing MR phase images subject to externally injected currents, while MREPT provides both conductivity and permittivity images at the Larmor frequency (128 MHz at 3 T) by processing B1 maps. In this paper, we present experimental results of both MREIT and MREPT and highlight their distinct features in probing and visualizing the same object.Noninvasive Functional Source Imaging of the Brain and Heart & 2011 8th International Conference on Bioelectromagnetism (NFSI & ICBEM), 2011 8th International Symposium on; 06/2011
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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 ICMREIT 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.IEEE Transactions on Magnetics 03/2013; · 1.42 Impact Factor
Conference Proceeding: Three-dimensional MREIT simulator (MREITSim)[show abstract] [hide abstract]
ABSTRACT: Magnetic resonance electrical impedance tomography (MREIT) is being developed to produce high-resolution cross-sectional conductivity images of an object. In MREIT, we scan the imaging object using an MRI scanner while injecting low-frequency current through surface electrodes. This produces change in the phase of precessing protons which is reflected in the MRI phase image. The conductivity imaging method in MREIT is thus based on static bioelectromagnetism and physics of MRI. In this paper, we describe a three-dimensional MREIT simulator (MREITSim) to numerically simulate the underlying physical phenomena in MREIT. We demonstrate the static bioelectromagnetism simulation and MREIT k-space data simulation as applications of this simulator. The simulator will be useful in developing new MREIT pulse sequences and conductivity image reconstruction algorithms.Noninvasive Functional Source Imaging of the Brain and Heart & 2011 8th International Conference on Bioelectromagnetism (NFSI & ICBEM), 2011 8th International Symposium on; 06/2011
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