Distinguishability analysis of an induced current EIT system using discrete coils

Eyüboğlu, B. Murat; Köksal, A.; Demirbilek, Murat

doi:10.1088/0031-9155/45/7/321

Cited by 16 publications

(11 citation statements)

References 13 publications

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“…Conventional ICEIT systems use typically several large coils with their axis perpendicular to the imaged cross-section to be used as sources. This arrangement has been used to obtain improved resolution at the central locations as compared with the EIT [30]. However, it is not possible to have a sensitive zone with the single plane configurations as proposed in this paper.…”

Section: Discussionmentioning

confidence: 99%

Enhancing Impedance Imaging Through Multimodal Tomography

Gürsoy

Mamatjan

Adler

et al. 2011

IEEE Trans. Biomed. Eng.

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Abstract-Several noninvasive modalities including electrical impedance tomography (EIT), magnetic induction tomography (MIT) and induced-current EIT (ICEIT) have been developed for imaging the electrical conductivity distribution within a human body. Although these modalities differ in how the excitation and detection circuitry (electrodes or coils) are implemented, they share a number of common principles not only within the image reconstruction approaches but also with respect to the basic principle of generating a current density distribution inside a body and recording the resultant electric fields. In this paper, we are interested in comparing differences between these modalities and in theoretically understanding the compromises involved, despite the increased hardware cost and complexity that such a multi-modal system brings along. To systematically assess the merits of combining data, we performed 3-D simulations for each modality and for the multi-modal system by combining all available data. The normalized sensitivity matrices were computed for each modality based on the finite element method and singular value decomposition was performed on the resultant matrices. We used both global and regional quality measures to evaluate and compare different modalities. This study has shown that the condition number of the sensitivity matrix obtained from the multi-modal tomography with 16-electrode and 16-coil is much lower than the condition number produced in the conventional 16-channel EIT and MIT systems, and thus, produced promising results in terms of image stability. An improvement of about 20% in image resolution can be achieved considering feasible signal to noise ratio (SNR) levels.

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Section: Discussionmentioning

confidence: 99%

Enhancing Impedance Imaging Through Multimodal Tomography

Gürsoy

Mamatjan

Adler

et al. 2011

IEEE Trans. Biomed. Eng.

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“…5,7,21 The numerical solver showed a low error of 0.18%, calculated as the maximal ratio between the surface potential differences between the analytical and numerical solutions at each boundary cell. The maximal and the mean surface potential errors were found to be 8.5e-7 V and 3.9e-7 V respectively.…”

Section: Solver Accuracy Validationmentioning

confidence: 97%

Induced Current Bio-impedance Technique for Monitoring Bone Mineral Density—A Simulation Model

2006

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In this study, the feasibility of using induced current bio-impedance technique as a method to determine and monitor bone mineral density (BMD) was theoretically evaluated using computerized simulation model. A 2D polar coordinates numerical solver was developed using the Finite Volume Method (FVM) in order to simulate the developed potentials over an axial CT cross section of a human thigh. Varying femur BMD were simulated by varying femur relative permittivity values. At the chosen excitation current of 1 ampere at a frequency of 20 kHz, the real component of the surface potential was found to be more sensitive to BMD variation than the imaginary component (3.9 microV g(-1) cm3 compared with 0.174 microV g(-1) cm3). The correlation between varying femur permittivities and the real component of the developed surface potential was found to be quadratic and influenced by the coil geometry and the measuring point location. Measurement sensitivity was improved either by taking the measuring point closer to the femur location or by minimizing the distance between the excitation coil and the femur. These results provide the basic principle that may enable a future use of bio-impedance technique for bone density evaluation and monitoring.

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“…So the ability to detect the change of conductivity (distinguishability) is enhanced through the giving of appropriate flow pattern 8,9 . So that one of the important issue is how to get the better coil configuration that improve the distinguishability.…”

Section: Introductionmentioning

confidence: 99%

“…So that one of the important issue is how to get the better coil configuration that improve the distinguishability. Improved induction system configuration has been done through the addition of induction 4 , the use of coil-shaped orthogonal 10 , the rectangular shaped coil 11 as well as coil segments 8 . Increasing the number of induction increase the amount of measurement data 4 but the optimal position of each induction has not been determined yet.…”

Section: Introductionmentioning

confidence: 99%

Study of Induced Current Electrical Impedance Tomography Configuration on 2 Dimensional Rectangular Object

Darmawan¹,

Kurniadi²,

Sudirham³

et al. 2014

Proceedings of the 2014 International Conference on Physics and Its Applications

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Sensitivity issue becomes a common problem on Electrical Impedance Tomography. One effort to overcome this issue is through inducing a magnetic field. It needs proper inducer coil configuration in order to produce a good reconstruction result. In this study, inducer coil configuration is obtained to 10 configurations of a rectangular object. Reconstruction results showed that the better results achieved through increasing of induction numbers and in 50 percent of shifting between each induction.

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Distinguishability analysis of an induced current EIT system using discrete coils

Cited by 16 publications

References 13 publications

Enhancing Impedance Imaging Through Multimodal Tomography

Enhancing Impedance Imaging Through Multimodal Tomography

Induced Current Bio-impedance Technique for Monitoring Bone Mineral Density—A Simulation Model

Study of Induced Current Electrical Impedance Tomography Configuration on 2 Dimensional Rectangular Object

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