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A New Calculation Method of the Sensitivity Coefficient for the ERT System

Xuan Li, Da Wang, Shihong Yue, Ding Chen, Feng Li, Huaxiang Wang
2022 IEEE Access  
Therefore, we propose a new sensitivity calculation method that has the advantages of clear physical significance, high robustness, and strong interpretability.  ...  However, the existing methods for calculating sensitivity matrix suffer from poor interpretability and operability.  ...  Therefore, the sensitivity matrix can be defined by the 208 × 812 sensitivity coefficients for the 16-electrode ERT system. III. A NEW SENSITIVITY CALCULATION METHOD A.  ... 
doi:10.1109/access.2022.3161549 fatcat:2b642bw4l5e3bd3sprpcqb4bpe

Width Optimization of Array Electrode for Human Lung Electrical Resistance Tomography System Based on prior Knowledge

Liqing Xiao, Ahmed Mostafa Khalil
2021 Complexity  
In electrical resistance tomography (ERT) technology for human lung, under the same experimental conditions, the width of the sensitive field boundary electrode has a significant impact on the calculation  ...  On this basis, the electrode width of the FEM was optimised by comparing the morbidity degrees of the sensitivity matrix and Hessian matrix, the uniformity of sensitivity distribution, and the quality  ...  Φ) � 0. (4) e calculation of forward problem for human lung ERT is to calculate the potential distribution of the sensitive field generated by the given boundary stimulating electrical signal to obtain  ... 
doi:10.1155/2021/4380220 fatcat:j7tyvg7zxndc5alv6tjwdse424

Multi-index optimization design for electrical resistance tomography sensor

Pai Wang, Baolong Guo, Nan Li
2013 Measurement (London)  
The experimental results indicate that the method can derive an evenly distributed sensitivity field and a better image with the optimized sensors, and improve the OERTIS of the ERT sensors by 13.75%.  ...  A multiple index optimization method for ERT sensors is put forward which combines an orthogonal design and fuzzy analysis.  ...  Method 3: the new method presented in this paper, the uniformity index P and correlation coefficient index a are set as the optimization objectives for the ERT sensor.  ... 
doi:10.1016/j.measurement.2013.03.021 fatcat:qlwf3ctgdrblrislmswcy2rezi

Quadrupole method: A new approach for solving the direct problem of electrical resistance tomography

Fatma Ouled Saad, Aymen Sdayria, Jamel Madiouli, Jalila Sghaier, Olivier Fudym
2017 Journal of King Saud University: Science  
The inverse problem is solved using the Levenberg-Marquardt method. A major source of uncertainty in tomographic inversion is the data error.  ...  The effect of Levenberg-Marquardt coefficient and initial value of the conductivity on the stability of the scheme was analyzed.  ...  N The sensitivity coefficients are calculated by the Direct Difference Method.  ... 
doi:10.1016/j.jksus.2016.08.007 fatcat:f55po6u42bac7lsjwu4u4qaqxe

Image Reconstruction Technology for Voidage Measurement in Two - phase Flow

Qifang Liu, College of Information Science and En gineering, Shanxi Agricultural University, Taigu030801 , China, Yan Han, Zhenyu Liu, Huifang Liu, National Key Laboratory of Electronic Testing Technology, North University of China, Taiyuan030051 , China, College of Information Science and En gineering, Shanxi Agricultural University, Taigu030801 , China, Faculty of medicine Engineering, University of Hong Kong , Hong Kong
2015 Journal of Engineering Science and Technology Review  
A new reconstructed algorithm based on forgetting factor-H∞ filter (FF-H∞ filter) for voidage measurement was developed in this study.  ...  The H∞ filter was applied to calculate the filter gain and error matrices for state variable formulation.  ...  Acknowledgements This work was supported by the National Natural Science Foundation of China (No. 31371527).  ... 
doi:10.25103/jestr.085.27 fatcat:ofisashyibbpxbgcyxn4n5jpwu

Fast Image Reconstruction Research Based on H$\infty$ Filtering for Electrical Resistance Tomography

Qifang Liu
2015 Journal of Fiber Bioengineering and Informatics  
Then, making the H∞ norm of this dynamic system as a cost function, a fast H∞ filtering algorithm is proposed whose criterion is to guarantee that the worst-cast effect of disturbance on estimation error  ...  Therefore, the method is suitable for on-line multiphase flow measurement.  ...  CT Model for ERT ERT system is composed of hardware parts which include the sensor array, analog switches, data acquisition system, and the computer to generate images.  ... 
doi:10.3993/jfbi03201512 fatcat:s6cymwod3vazvprbiqmfmzjt2u

Fusion Research of Electrical Tomography with Other Sensors for Two-phase Flow Measurement

Xiang Deng, W. Yang
2012 Measurement Science Review  
Some research results of fusion methods are presented and discussed. This paper can provide the theoretical support for the multi-sensor fusion for two-phase flow measurement.  ...  In this paper, fusions of (1) electrical resistance tomography (ERT) with electromagnetic (EM) flowmeter, (2) electrical capacitance tomography (ECT) with ERT and (3) ECT with electrostatic sensor are  ...  Xiang Deng would like to thank Beijing Jiaotong University for the financial support to be academic visitor at The University of Manchester.  ... 
doi:10.2478/v10048-012-0008-7 fatcat:gbkud5rovjcclgf2slwssqgkni

A Fast Barzilai-Borwein Gradient Projection for Sparse Reconstruction Algorithm Based on 3D Modeling: Application to ERT Imaging

Shouxiao Li, Huaxiang Wang, Tonghai Liu, Ziqiang Cui, Joanna N. Chen, Zihan Xia
2021 IEEE Access  
An effective method of Barzilai-Borwein gradient projection for sparse reconstruction (GPSR-BB) can resolve the inverse problem into boundconstrained quadratic programming and achieve a gradient projection  ...  Image reconstruction for electrical resistance tomography (ERT) is an ill-posed inverse problem. L 1 regularization is used to solve the inverse problem.  ...  In ERT, S is usually calculated by a sensitivity method. The inverse problem of ERT is ill-posed. Tikhonov regularization replaces the inverse problem of (4) with a minimization one.  ... 
doi:10.1109/access.2021.3127695 fatcat:j4nvmnu5p5fwlcppahiy667cwy

The inverse source problem based on the radiative transfer equation in optical molecular imaging

Alexander D. Klose, Vasilis Ntziachristos, Andreas H. Hielscher
2005 Journal of Computational Physics  
At each iteration step the predicted data are calculated by a forward model for light propagation based on the equation of radiative transfer.  ...  We present the first tomographic reconstruction algorithm for optical molecular imaging that is based on the equation of radiative transfer.  ...  Klose from the Ernst Schering Research Foundation, Germany, and a grant from the National Institute of Biomedical Imaging and Bioengineering (5 R33 CA 91807-3), which is part of the National Institutes  ... 
doi:10.1016/j.jcp.2004.07.008 fatcat:2wq5bbh3ivfttnwz4xzmirszgq

STABILITY INDICATING METHOD DEVELOPMENT AND VALIDATION OF METFORMIN AND ERTUGLIFLOZIN BY HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY WITH PDA DETECTION AND ITS APPLICATION TO TABLET DOSAGE FORM

KADALI JAGADEESH, ANNAPURNA N
2019 Asian Journal of Pharmaceutical and Clinical Research  
Objective: A sensitive, rapid, accurate, and precise stability indicating high-performance liquid chromatography method was developed and validated for the simultaneous estimation of metformin (MET) and  ...  Conclusion: The results recommended method suitability for the analysis of MET and ERT in quality control laboratories.  ...  This indicates that the new HPLC method is robust for the analysis of ERT and MET (Table 6) .  ... 
doi:10.22159/ajpcr.2019.v12i3.30626 fatcat:6q75723qjzexjkaynqo43fxvku

Functional imaging of small tissue volumes with diffuse optical tomography

Alexander D. Klose, Andreas H. Hielscher, Armando Manduca, Amir A. Amini
2006 Medical Imaging 2006: Physiology, Function, and Structure from Medical Images  
These optimization techniques use the gradient . ) of the objective function with respect to the optical parameters s ! and a ! for calculating a search direction k u to find a new update 1 ( k !  ...  The ERT needs to be solved with numerical methods since no analytical solutions of the ERT exist for non-uniform media with complex geometries.  ... 
doi:10.1117/12.659349 fatcat:qnjebntiwbevnnbqc2br24imva

A New Iterative Algorithm Based on Correction of Sensitivity Matrix for Electrical Resistance Tomography

Yutong Chen, Yan Han, Wuqiang Yang, Kun Li
2019 Mathematical Problems in Engineering  
matrix, and a correction coefficient with a penalty.  ...  To reduce the error, an improved iterative image reconstruction algorithm is proposed, which is based on calculation of the error between the generic sensitivity matrix and the theoretical sensitivity  ...  In this paper, the effect of the generic sensitivity matrix on image quality is analyzed, and a new image reconstruction algorithm is proposed, which is based on calculating the error introduced by the  ... 
doi:10.1155/2019/6384132 fatcat:qre4tmdtdbhpzorow6rd5ucqoq

Plasma L-Ergothioneine Measurement by High-Performance Liquid Chromatography and Capillary Electrophoresis after a Pre-Column Derivatization with 5-Iodoacetamidofluorescein (5-IAF) and Fluorescence Detection

Salvatore Sotgia, Elisabetta Pisanu, Gianfranco Pintus, Gian Luca Erre, Gerard Aime Pinna, Luca Deiana, Ciriaco Carru, Angelo Zinellu, Maxim Antopolsky
2013 PLoS ONE  
The methods were validated and found to be linear in the range of 0.3 to 10 mmol/l. The limit of quantification was 0.27 mmol/l for HPCE and 0.15 mmol/l for HPLC.  ...  Two sensitive and reproducible capillary electrophoresis and high-performance liquid chromatography-fluorescence procedures were established for quantitative determination of L-egothioneine in plasma.  ...  Acknowledgments The manuscript language revision by Mrs. Maria Antonietta Meloni is greatly appreciated. Author Contributions  ... 
doi:10.1371/journal.pone.0070374 pmid:23922985 pmcid:PMC3726632 fatcat:2nakoodojzcwplqjiwz3xrbuba

Combination of Hyperspectral and Machine Learning to Invert Soil Electrical Conductivity

Pingping Jia, Junhua Zhang, Wei He, Yi Hu, Rong Zeng, Kazem Zamanian, Keli Jia, Xiaoning Zhao
2022 Remote Sensing  
This provides a theoretical support for the quantitative monitoring of soil salinization on a larger scale using remote sensing techniques.  ...  A gradient boosting machine (GBM) was used to select sensitive spectral parameters.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/rs14112602 fatcat:7b57oynfsvcc3ilshvbb22im3m

A remote-control datalogger for large-scale resistivity surveys and robust processing of its signals using a software lock-in approach

Frank Oppermann, Thomas Günther
2018 Geoscientific Instrumentation, Methods and Data Systems  
For the analysis of this time series we present a new approach that is based on the lock-in (LI) method, mainly known from electronic circuits.  ...  </strong> We present a new versatile datalogger that can be used for a wide range of possible applications in geosciences.  ...  We like to thank Raphael Rochlitz, Robert Meyer, Dieter Epping and Vitali Kipke for help in producing the field data as part of the DESMEX project funded by the German Ministry of Education and Research  ... 
doi:10.5194/gi-7-55-2018 fatcat:wkjeeo4fmfhlpm7v4xasetkcai
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