Image reconstruction using voltage–current system in electrical impedance tomography

Kim, Bong Seok; Khambampati, Anil Kumar; Jang, Yeong-Jun; Kim, Kyung Youn; Kim, Sin

doi:10.1016/j.nucengdes.2014.07.023

Cited by 18 publications

(40 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the inverse problem, the conductivity distributions are estimated. This is achieved by minimizing the differences between the calculated and the measured electrical signals on the electrodes [ 54 ]. The inverse problems do not have a unique solution; hence, a small change in the data can cause large changes in the resulting mathematical solution/reconstructed images [ 55 ].…”

Section: Ert Imagingmentioning

confidence: 99%

“…Several factors according to which an engineer or an analyst can make a prior decision for a targeted quantitative evaluation using the ERT device are mentioned in Figure 3 . For example, the methodology for the data acquisition can either be a V-C or a C-V [ 54 ]. A higher frame rate is required for the process technology involving a reaction crystallization, compared to the cooling crystallization.…”

Section: Ert Imagingmentioning

confidence: 99%

“…The voltage–current (VC) evaluation methodology was utilized [ 54 ]. In this type of methodology, implemented using 16 electrodes, E1 to E16, the evaluation is done in the following manner.…”

Section: Experimental Designmentioning

confidence: 99%

See 2 more Smart Citations

Quantitative Evaluations with 2d Electrical Resistance Tomography in the Low-Conductivity Solutions Using 3d-Printed Phantoms and Sucrose Crystal Agglomerate Assessments

Rao

Sattar

Wajman

et al. 2021

Sensors

View full text Add to dashboard Cite

Crystallization is a significant procedure in the manufacturing of many pharmaceutical and solid food products. In-situ electrical resistance tomography (ERT) is a novel process analytical tool (PAT) to provide a cheap and quick way to test, visualize, and evaluate the progress of crystallization processes. In this work, the spatial accuracy of the nonconductive phantoms in low-conductivity solutions was evaluated. Gauss–Newton, linear back projection, and iterative total variation reconstruction algorithms were used to compare the phantom reconstructions for tap water, industrial-grade saturated sucrose solution, and demineralized water. A cylindrical phantom measuring 10 mm in diameter and a cross-section area of 1.5% of the total beaker area was detected at the center of the beaker. Two phantoms with a 10-mm diameter were visualized separately in noncentral locations. The quantitative evaluations were done for the phantoms with radii ranging from 10 mm to 50 mm in demineralized water. Multiple factors, such as ERT device and sensor development, Finite Element Model (FEM) mesh density and simulations, image reconstruction algorithms, number of iterations, segmentation methods, and morphological image processing methods, were discussed and analyzed to achieve spatial accuracy. The development of ERT imaging modality for the purpose of monitoring crystallization in low-conductivity solutions was performed satisfactorily.

show abstract

Section: Ert Imagingmentioning

confidence: 99%

Section: Ert Imagingmentioning

confidence: 99%

See 1 more Smart Citation

Quantitative Evaluations with 2d Electrical Resistance Tomography in the Low-Conductivity Solutions Using 3d-Printed Phantoms and Sucrose Crystal Agglomerate Assessments

Rao

Sattar

Wajman

et al. 2021

Sensors

View full text Add to dashboard Cite

show abstract

“…In the inverse problem, the Jacobian matrix J is evaluated using current I in Equation 6, where the conductivity distribution σ is considered as piecewise constant and is expressed as in Equation 5 [53].…”

Section: Application Of a Voltage Injected-current Detected (V-c) Basmentioning

confidence: 99%

Process Monitoring of Antisolvent Based Crystallization in Low Conductivity Solutions Using Electrical Impedance Spectroscopy and 2-D Electrical Resistance Tomography

et al. 2020

View full text Add to dashboard Cite

Industrial process monitoring is an important field of research where different chemical processes are monitored and controlled. In this work, electrical impedance spectroscopy (EIS) was used to analyze antisolvent based crystallization of sucrose solutions. The impedance and phase spectra were recorded for four known sucrose concentrations in water, and for each case, four predetermined amounts of ethanol were added. As a result, sixteen different solutions involving sucrose solutions of different concentrations and ethanol to water ratios were analyzed. Significant differences were observed in the magnitude and phase spectra of the solutions in the frequency range of 50 kHz to 300 kHz. The experimentally obtained data from the EIS were converted into frequency response models. Three continuous-time transfer function models of the first-order, second-order, and a second-order with a zero were estimated and compared. In addition, a 2-D electrical resistance tomography (ERT) system with a low conductivity sensor unit was designed and tested with demineralized water, tap water and industrial food grade saturated sucrose solution. Non-conducting phantom and sugar crystals were observed within the saturated sucrose solution using the Bayesian reconstruction algorithm. These demonstrations have the potential to be developed into a multi-frequency ERT systems for monitoring the distribution of the crystals in the reactor. The EIS modality can be a complementary process analytical technology (PAT) tool indicating supersaturation status and provide quality assurance.

show abstract

“…Розв'язок зворотної задачі може бути украй нестабільним, навіть невеликий шум може значно посилитися та привести в непридатність увесь результат обчислень (Adler and Guardo, 1996;Asfaw and Adler, 2005). Отримати дані без шуму неможливо, оскільки мають місце такі явища як зміна розподілу провідності шкіри в місцях прикріплення електродів, рух електродів, неможливість точного (відповідно до моделі) закріплення електродів, а також шуми від електронних елементів (Kim et al, 2014). У зв'язку з обмеженням розміру електродів і певними вимогами до їх розміщення кількість незалежних вимірювань завжди набагато менша, ніж число елементів зображення, які потрібно отримати.…”

Section: матеріал і методи дослідженьunclassified

Effects of electrical impedance measuring methods on two-dimensional tomogram recovery of biological tissues

Snizhko

Milykh

Gasanov

2018

Regul. Mech. Biosyst.

View full text Add to dashboard Cite

The purpose of electrical impedance tomography is to obtain the electrical impedance distribution in the domain of interest by injecting the currents or applying voltages and measuring voltages or currents via a number of electrodes that are mounted on the boundary of the domain. We investigated the influence of various alternating current injection methods on conductivity allocation recovery in biological tissues. We used 16 electrodes allocated uniformly on a circle perimeter. The research technique includes the mathematical modeling by finite element method with 576 nodes. The current injection was performed through two electrodes located nearby (dipole assignment), opposite (polar assignment) or with a shift by 3 electrodes (a quarter of circle). We registered the potential differences between other electrodes for calculation of the internal conductivity allocation by the finite element method. The study revealed that dipole current injection impoved the sensitivity of the method, and polar injection refined the resolution capability. We used the absolute and difference calculation methods implemented in the programming package of potentials allocation and image reconstruction EIDORS (Electrical Impedance and Diffuse Optical Tomography Reconstruction Software). EIDORS is an open source software system for image reconstruction in the electrical impedance tomography and diffuse optical tomography, designed to facilitate collaboration, testing and new research in these fields. Several numerical examples with inclusion of various convex and non-convex smooth shapes (e.g. circular, elliptic, square-shaped) and sizes are presented and thoroughly investigated. The experiments revealed phantoms at round form discontinuities of conductivity. As an accuracy criterion, we selected mean-square and maximum deviation values of the reconstructed image from the true conductivity allocation. The study showed the advantages, lacks and application fields of dipole, polar and other methods of the current injection. The experiments demonstrated the optimal parameters for reconstruction of internal conductivities at various methods of stimulation. The model with polar electrodes showed the best results by the criterion of maximum deviation. The model with electrodes shifted on a circle quarter revealed the best results by mean-square error criterion.

show abstract

Image reconstruction using voltage–current system in electrical impedance tomography

Cited by 18 publications

References 24 publications

Quantitative Evaluations with 2d Electrical Resistance Tomography in the Low-Conductivity Solutions Using 3d-Printed Phantoms and Sucrose Crystal Agglomerate Assessments

Quantitative Evaluations with 2d Electrical Resistance Tomography in the Low-Conductivity Solutions Using 3d-Printed Phantoms and Sucrose Crystal Agglomerate Assessments

Process Monitoring of Antisolvent Based Crystallization in Low Conductivity Solutions Using Electrical Impedance Spectroscopy and 2-D Electrical Resistance Tomography

Effects of electrical impedance measuring methods on two-dimensional tomogram recovery of biological tissues

Contact Info

Product

Resources

About