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Distinguishability for Magnetic Resonance-Electric Impedance Tomography (MR-EIT)
Date
2006-09-01
Author
Altunel, H.
Eyüboğlu, Behçet Murat
KÖKSAL, ADNAN
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In magnetic resonance-electrical impedance tomography, magnetic flux density due to current injection is the measured quantity. Different conductivity distributions create different magnetic flux density distributions. Distinguishability for MR-EIT is defined using this fact. The definition is general and valid for 2D as well as 3D structures of any shape. It is not always possible to find an analytic expression for distinguishability. However, when a 2D cylindrical body with concentric inhomogeneity is considered, the distinguishability can be analytically formulated. For this structure, distinguishable regions defined by potential based and magnetic flux density based distinguishabilities are compared. Magnetic flux density is found to provide better distinguishability than surface potential case. This distinguishability definition also puts the main criterion for current optimization problems for MR-EIT.
Subject Keywords
Distinguishability
,
Magnetic resonance
,
Electrical impedance
,
Tomography
URI
https://hdl.handle.net/11511/55876
Conference Name
World Congress on Medical Physics and Biomedical Engineering
Collections
Department of Electrical and Electronics Engineering, Conference / Seminar
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Magnetic Resonance - Electrical Impedance Tomography (MR-EIT) Research at METU
Eyüboğlu, Behçet Murat (2006-09-01)
Following development of magnetic resonance current density imaging (MRCDI), magnetic resonance - electrical impedance tomography (MR-EIT) has emerged as a promising approach to produce high resolution conductivity images. Electric current applied to a conductor results in a potential field and a magnetic flux density distribution. Using a magnetic resonance imaging (MRI) system, the magnetic flux density distribution can be reconstructed as in MRCDI. The flux density is related to the current density distr...
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Current density distribution generated inside a volume conductor by externally applied currents can be calculated by using spatial distribution of its magnetic flux density, . The imaging modality used to reconstruct images of the current density distribution is known as magnetic resonance current density imaging (MRCDI). In MRCDI, spatial distribution of the current-induced magnetic flux density is measured on a magnetic resonance imaging (MRI) platform. Calculation of current density distribution from mag...
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In this study, a direct reconstruction algorithm for Magnetic Resonance Electrical Impedance Tomography (MR-EIT) is proposed and experimentally implemented for high resolution true conductivity imaging. In MR-EIT, elec trical impedance tomography (EIT) and magnetic resonance imaging (MRI) are combined together. Current density measurements are obtained making use of Magnetic Resonance Current Density Imaging (MR-CDI) techniques and peripheral potential measurements are determined using conventional EIT tech...
Current injection optimization for magnetic resonance-electrical impedance tomography (MREIT)
Altunel, H.; Eyüboğlu, Behçet Murat; KÖKSAL, ADNAN (2007-09-02)
Determining optimum current injection pattern is of interest in magnetic resonance-electrical impedance tomography (MREIT), since it helps in detecting smaller inhomogeneities within the body when total injected current into the body is limited. Based on this fact, for 2-D cylindrical body with concentric and cylindrical inhomogeneity, current injection optimization problem is analytically formulated, based on distinguishability definition for MREIT. The exterior penalty method is used to solve the optimiza...
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H. Altunel, B. M. Eyüboğlu, and A. KÖKSAL, “Distinguishability for Magnetic Resonance-Electric Impedance Tomography (MR-EIT),” Seoul, SOUTH KOREA, 2006, vol. 14, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/55876.
