Image reconstruction using simulated annealing in electrical impedance tomography: a new approach

Martins, J. S. Sá; Moura, Cássio Stein; Vargas, Rubem Mário Figueiró

doi:10.1080/17415977.2017.1361420

Cited by 9 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This approach transforms the original system into a target system. This technique has been extensively employed in reconstructing stochastic heterogeneous materials (SHM) [30][31][32][39][40][41] , demonstrating its versatility and effectiveness. However, it is essential to de ne some fundamental bases.…”

Section: Simulated Annealingmentioning

confidence: 99%

Theoretical analysis of the effect of isotropy on the effective diffusion coefficient in the porous and agglomerated phase of the electrodes of a PEMFC

Pacheco,

Barbosa,

Navarro-Montejo

et al. 2024

Preprint

View full text Add to dashboard Cite

In polymer membrane fuel cells (PEMFC), the pore microstructure and the effective diffusion coefficient (\({D}_{eff}\)) of the catalytic layer have a significant impact on the overall performance of the fuel cell. In this wok, numerical methods to simulate PEMFC catalytic layers were used to study the effect of isotropy (\({I}_{xy}\)) on the \({D}_{eff}\). The proposed methodology studies reconstructed systems by Simulated Annealing (SA) imaging with different surface fractions of microstructures composed by two diffusive phases: agglomerates and pores. The \({D}_{Eff}\) is determined numerically by the Finite Volume Method (FVM) solved for Fick's First Law of Diffusion. The results show that the proposed methodology can effectively quantify the effect of isotropy on the \({D}_{eff}\) for both diffusion phases. Two trends were obtained in the magnitude of the \({D}_{eff}\) concerning the change in isotropy: a) when the surface fraction is more significant than 50%, the \({D}_{eff}\) decreases linearly at the beginning and exponentially at the end of the isotropy change, which indicates that small changes in isotropy in the particulate material modify it drastically. b) When the surface fraction is less than 50%, the \({D}_{eff}\) decreases exponentially at the beginning and linearly at the end of the isotropy change, which shows that small isotropy changes in the bar-aligned material drastically alter it. The proposed methodology can be used as a design tool to improve the mass transport in porous PEMFC electrodes.

show abstract

Section: Simulated Annealingmentioning

confidence: 99%

Theoretical analysis of the effect of isotropy on the effective diffusion coefficient in the porous and agglomerated phase of the electrodes of a PEMFC

Pacheco,

Barbosa,

Navarro-Montejo

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…The typical forward problem in EIT, geophysical research and underwater detecting involves obtaining the potential distribution in region with the boundary condition ∂ , supposing the conductivity distribution in is already known [29]. The continuous quasi-static electric potential distribution in area is given by…”

Section: B Forward Modelmentioning

confidence: 99%

Improved Primal–Dual Interior-Point Method Using the Lawson-Norm for Inverse Problems

Shang

Xue

et al. 2020

IEEE Access

View full text Add to dashboard Cite

Electrical impedance tomography (EIT), geophysics and undersea target reconstruction are typical non-linear ill-posed inverse problems, and in many cases, the anomalous bodies feature with a clear boundary. Thus, it is suitable to obtain sharp boundaries and blocky features with the Total Variation (TV) functional regularization. However, the TV function regularization leads to a non-differentiable objective function at zero in the inverse formulation and reduces the algorithm robustness. In this paper, we propose an improved primal-dual interior-point method (PD-IPM) based on the Lawson norm to get sharp spatial profiles of the anomalous bodies. Furthermore, the impact of the smooth parameter is investigated to get the inverse results. Numerical experiment using simulated data is setup to support our claim. INDEX TERMS Inverse problems, improved primal-dual interior-point method, Lawson norm.

show abstract

“…1 With the development of artificial intelligence in recent years, EIT has once again received widespread attention. [2][3][4] The advantages of EIT technology lie in its radiation-free, non-destructive, and fast response. 5 Although EIT does not show as much detail as computerized tomography (CT), it can detect cancer in advance by monitoring the impedance difference between normal cells and cancer cells.…”

mentioning

confidence: 99%

A woven electrode with convex structure for electrical impedance tomography

Zhang

Zhong

Wang

et al. 2021

Textile Research Journal

View full text Add to dashboard Cite

We developed a silver/silver chloride (Ag/AgCl) woven electrode, which was woven in a convex high-density structure. The convex structure can decrease the motion artifacts caused by the slippage between human skin and the electrode. The high density can reduce the noise caused by the change of contact resistance. The model of the electrode–skin interface was proposed, and its equivalent circuit model was built, which can present an intuitive understanding of electrode design principles. Furthermore, AgCl particles were electrochemically deposited on the Ag electrode in terms of 23 schemes to optimize the deposition uniformity. The effects of deposition time, electrolyte concentration, and current/voltage magnitude were investigated. According to the result, the best combination is a constant current method, with the current at 0.01 A, the deposition time set to 300 s, and the electrolyte concentration as 0.05 M. The resistances of the deposited electrodes are qualified for impedance monitoring due to their small resistance. A bioimpedance system was assembled followed by the electrical impedance tomography mechanism. The frequency response and bioimpedance–time relationship were measured and analyzed in our bioimpedance system. The result reveals that the frequency response from [Formula: see text] to[Formula: see text] Hz presents a stable state for the convex woven electrode. The woven electrode system has a wider stable frequency band than the wet electrode. The bioimpedance of wet electrodes is stable in the initial time, whereas that of woven electrodes decreases with time. However, the wet electrode bioimpedance increases with time after 3 h, and the woven electrode bioimpedance is stable after 3 h. Both the interface capacitance and resistance have very important roles in the bioimpedance system. The woven electrode is better in long-term monitoring than the wet electrode. In addition, convex electrode bioimpedance presents less noise than the plain electrode. Therefore, the convex electrode is the best choice for the bioimpedance monitoring system.

show abstract

Image reconstruction using simulated annealing in electrical impedance tomography: a new approach

Cited by 9 publications

References 23 publications

Theoretical analysis of the effect of isotropy on the effective diffusion coefficient in the porous and agglomerated phase of the electrodes of a PEMFC

Theoretical analysis of the effect of isotropy on the effective diffusion coefficient in the porous and agglomerated phase of the electrodes of a PEMFC

Improved Primal–Dual Interior-Point Method Using the Lawson-Norm for Inverse Problems

A woven electrode with convex structure for electrical impedance tomography

Contact Info

Product

Resources

About