Deep Autoencoder Imaging Method for Electrical Impedance Tomography

2021 ◽  
pp. 1-1
Author(s):  
Xiaoyan Chen ◽  
Zichen Wang ◽  
Xinyu Zhang ◽  
Rong Fu ◽  
Di Wanga ◽  
...  
Keyword(s):  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Imaging Method ◽  
Impedance Tomography

scholarly journals Regional analysis of airway abnormalities in cystic fibrosis employing Electrical Impedance Tomography

2018 ◽  
Vol 4 (1) ◽  
pp. 105-108
Author(s):  
Sabine Krueger-Ziolek ◽  
Bo Gong ◽  
Hanna Zimmermann ◽  
Ullrich Müller-Lisse ◽  
Knut Möller
Keyword(s):  
Cystic Fibrosis ◽  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Regional Analysis ◽  
Middle Lobe ◽  
Imaging Method ◽  
Impedance Tomography ◽  
Morphological Defects ◽  
Left And Right ◽  
Airway Abnormalities

AbstractTo estimate the severity of airway abnormalities in cystic fibrosis (CF) Brody et al. developed a computed tomography (CT) scoring system. Each pulmonary lobe is analyzed separately considering various morphological defects. A study from Zhao et al. demonstrates that this CTbased score correlates with regional airway obstruction (RAO) measured by the real-time imaging method Electrical Impedance Tomography (EIT). Zhao et al. performed EIT measurements at the 5th intercostal space (ICS) and median RAO, including both lungs, was correlated with the associated score. In the present feasibility study, it was investigated if RAO determined by EIT within the left and right lung respectively at the 3rd and 5th ICS corresponds with the scores of the left and right lobes. EIT measurements and CT-based scoring were carried out on two CF patients. RAO was identified by ratios of impedance values associated to the maximal forced expiratory flow at 25% and 75% of the forced vital capacity. Mean RAO of each lung within both thorax sections was compared with the lobar scores. Airway abnormalities within upper lobes are assigned to RAO measured within the 3rd ICS, whereas abnormalities of the right middle lobe, both lower lobes and the lingula are mainly represented by EIT images of the 5th ICS. Results show that differences in the CT-based score between the left and right lung concur with differences in EIT derived RAO. The regional information provided by EIT might be used for a more targeted therapy of CF-related lung diseases.

scholarly journals EIT Imaging of Intracranial Hemorrhage in Rabbit Models Is Influenced by the Intactness of Cranium

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Meng Dai ◽  
Xue-Chao Liu ◽  
Hao-Ting Li ◽  
Can-Hua Xu ◽  
Bin Yang ◽  
...  
Keyword(s):  
Electrical Impedance Tomography ◽  
Intracranial Hemorrhage ◽  
Future Study ◽  
Electrical Impedance ◽  
Imaging Method ◽  
Impedance Tomography ◽  
Whole Brain ◽  
Cerebral Parenchyma ◽  
The Difference ◽  
The One

Electrical impedance tomography (EIT) has been shown to be a promising, bedside imaging method to monitor the progression of intracranial hemorrhage (ICH). However, the observed impedance changes within brain related to ICH differed among groups, and we hypothesized that the cranium intactness (open or closed) may be the one of potential reasons leading to the difference. Therefore, the aim of this study was to investigate this effect of open or closed cranium on impedance changes within brain in the rabbit ICH model. In this study, we first established the ICH model in 12 rabbits with the open cranium and in 12 rabbits with the closed cranium. Simultaneously, EIT measurements on the rabbits’ heads were performed to record the impedance changes caused by injecting the autologous nonheparinized blood into cerebral parenchyma. Finally, the regional impedance changes on EIT images and the whole impedance changes were analyzed. It was surprisingly found that when the cranium was open, the impedance of the area where the blood was injected, as well as the whole brain impedance, decreased with the amount of blood being injected; when the cranium was closed, while the impedance of the area where blood was not injected continued to increase, the impedance of the area where blood was injected decreased within 20s of the blood being injected and then remained almost unchanged, and the whole brain impedance had a small fall and then notably increased. The results have validated that the cranium completeness (open or closed) has influences on impedance changes within brain when using EIT to monitor ICH. In future study on application of EIT to monitor ICH, the cranium completeness should be taken into account for establishing an ICH model and analyzing the corresponding EIT results.

scholarly journals Electrical Impedance tomography – recent applications and developments

2021 ◽  
Vol 12 (1) ◽  
pp. 50-62
Author(s):  
Sofiene Mansouri ◽  
Yousef Alharbi ◽  
Fatma Haddad ◽  
Souhir Chabcoub ◽  
Anwar Alshrouf ◽  
...  
Keyword(s):  
Image Reconstruction ◽  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Low Cost ◽  
Noninvasive Imaging ◽  
Imaging Method ◽  
Impedance Tomography ◽  
Large Margin ◽  
Reconstruction Methods ◽  
Imaging Approach

Abstract Electrical impedance tomography (EIT) is a low-cost noninvasive imaging method. The main purpose of this paper is to highlight the main aspects of the EIT method and to review the recent advances and developments. The advances in instrumentation and in the different image reconstruction methods and systems are demonstrated in this review. The main applications of the EIT are presented and a special attention made to the papers published during the last years (from 2015 until 2020). The advantages and limitations of EIT are also presented. In conclusion, EIT is a promising imaging approach with a strong potential that has a large margin of progression before reaching the maturity phase.

The Hardware System of Rotational Electrical Impedance Tomography

2013 ◽  
Vol 329 ◽  
pp. 397-400
Author(s):  
Jun Yan ◽  
Yao Zheng
Keyword(s):  
Image Quality ◽  
Electrical Impedance Tomography ◽  
Measurement System ◽  
Electrical Impedance ◽  
Electrical Potential ◽  
Alternating Current ◽  
Imaging Method ◽  
Impedance Tomography ◽  
Object A ◽  
Hardware System

Electrical impedance tomography (EIT) is an imaging method of the resistivity distribution within a domain. The images are estimated from a set of electrical potential measurements at the boundary of a domain, which are caused by applying current through electrodes fixed at its boundary. In order to improve the image quality, a rotational electrical impedance tomography (REIT) system is proposed to expand the measurement sites by shifting the electrodes. The hard system of REIT is established in the paper, which is composed of three subsystems, rotary scheme, and switches network and measurement system. By injecting the alternating current into the object, a potential will be established on the boundary electrodes of object. The reconstruct results based on REIT system are improved obviously.

scholarly journals A Review on Electrical Impedance Tomography Spectroscopy

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5160
Author(s):  
Juliana Padilha Leitzke ◽  
Hubert Zangl
Keyword(s):  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Image Representation ◽  
Imaging Method ◽  
Reconstruction Algorithms ◽  
Impedance Tomography ◽  
Frequency Dependent ◽  
Measurement Systems ◽  
Object Based ◽  
Physical Principles

Electrical Impedance Tomography Spectroscopy (EITS) enables the reconstruction of material distributions inside an object based on the frequency-dependent characteristics of different substances. In this paper, we present a review of EITS focusing on physical principles of the technology, sensor geometries, existing measurement systems, reconstruction algorithms, and image representation methods. In addition, a novel imaging method is proposed which could fill some of the gaps found in the literature. As an example of an application, EITS of ice and water mixtures is used.

scholarly journals A Local Region of Interest Imaging Method for Electrical Impedance Tomography with Internal Electrodes

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Hyeuknam Kwon ◽  
Alistair L. McEwan ◽  
Tong In Oh ◽  
Adnan Farooq ◽  
Eung Je Woo ◽  
...  
Keyword(s):  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Region Of Interest ◽  
Local Region ◽  
Imaging Method ◽  
Reconstruction Method ◽  
Impedance Tomography ◽  
Internal Electrode ◽  
Surface Electrodes ◽  
Physical Measurements

Electrical Impedance Tomography (EIT) is a very attractive functional imaging method despite the low sensitivity and resolution. The use of internal electrodes with the conventional reconstruction algorithms was not enough to enhance image resolution and accuracy in the region of interest (ROI). We propose a local ROI imaging method with internal electrodes developed from careful analysis of the sensitivity matrix that is designed to reduce the sensitivity of the voxels outside the local region and optimize the sensitivity of the voxel inside the local region. We perform numerical simulations and physical measurements to demonstrate the localized EIT imaging method. In preliminary results with multiple objects we show the benefits of using an internal electrode and the improved resolution due to the local ROI image reconstruction method. The sensitivity is further increased by allowing the surface electrodes to be unevenly spaced with a higher density of surface electrodes near the ROI. Also, we analyse how much the image quality is improved using several performance parameters for comparison. While these have not yet been studied in depth, it convincingly shows an improvement in local sensitivity in images obtained with an internal electrode in comparison to a standard reconstruction method.

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