Design of wearable and wireless electrical impedance tomography system

Huang, Ji Jer; Hung, Yi Hsuan; Wang, Jhi Joung; Lin, Bor-Shyh

doi:10.1016/j.measurement.2015.09.031

Cited by 23 publications

(18 citation statements)

References 21 publications

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“…Another of its limitations is that the system only works offline. In [39], another EIT system based on a microprocessor can be observed, which consists of 16 channels that, unlike the prototype presented in [38],…”

Section: Resultsmentioning

confidence: 99%

“…The EIT prototypes proposed by the scientific community are integrated with analog components and control devices [97], especially used in the processes of signal generation, measurement and processing. This is how proposals are based on FPGA [5], [34], [36], [98], [99], DSP [91], [100] and Microcontrollers [39], [40], which present modular architectures. Although they have sufficient characteristics for particular medical applications, these proposals have limitations such as the calibration of the modules for generating sinusoidal signals, reconfiguration of injection patterns and measurement of signals, which may require a hardware reconfiguration [101], [102].…”

Section: Discussionmentioning

confidence: 99%

“…In [39], [61], [66], [68], [71], [72], systems developed by researchers oriented to pulmonary applications are evaluated. These works detail the development and hardware characteristics; their results are based on tests using phantoms, and sometimes on healthy volunteers.…”

Section: Eit System Orientatedmentioning

confidence: 99%

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Electrical Impedance Tomography: Hardware Fundamentals And Medical Applications

Revelo

2020

ing. Solidar

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Introduction: The following article shows a systematic review of publications on hardware topologies used to capture and process electrical signals used in Electrical Impedance Tomography (EIT) in medical applications, as well topicality of the EIT in the field of biomedicine. This work is the product of the research project “Electrical impedance tomography based on mixed signal devices”, which took place at the University of Cauca during the period 2017-2019. Objective: This review describes the operation, topicality and clinical use of Electrical Impedance Tomography systems. Methodology: A systematic review was carried out in the IEEE-Xplore, ScienceDirect and Scopus databases. After the classification, 106 relevant articles were obtained on scientific studies of EIT systems; applications dedicated to the analysis of medical images. Conclusions: Impedance-based methods have a variety of medical applications as they allow for the reconstruction of a body region, by estimating the conductivity distribution inside the human body; this is without exposing the patient to the damaging effects of radiation and contrast elements. Impedance-based methods are therefore a very useful and versatile tool in the treatment of diseases such as: monitoring blood pressure, detection of atherosclerosis, localization of intracranial hemorrhages, determining bone density, among others. Originality: It describes the necessary components to design an EIT system, as well as the design characteristics depending on the pathology to be visualized. Restrictions: The review focuses on aspects of the performance of an EIT system, depending on the pathology analyzed. Considering the hardware advances, it is possible to increase the acquisition speed (temporal resolution), thus improving the spatial resolution and the quality of the reconstructed image. Introduction: The following article shows a systematic review of publications on hardware topologies used to capture and process electrical signals used in Electrical Impedance Tomography (EIT) in medical applications, as well topicality of the EIT in the field of biomedicine. This work is the product of the research project “Electrical impedance tomography based on mixed signal devices”, which took place at the University of Cauca during the period 2017-2019. Objective: This review describes the operation, topicality and clinical use of Electrical Impedance Tomography systems. Methodology: A systematic review was carried out in the IEEE-Xplore, ScienceDirect and Scopus databases. After the classification, 106 relevant articles were obtained on scientific studies of EIT systems; applications dedicated to the analysis of medical images. Conclusions: Impedance-based methods have a variety of medical applications as they allow for the reconstruction of a body region, by estimating the conductivity distribution inside the human body; this is without exposing the patient to the damaging effects of radiation and contrast elements. Impedance-based methods are therefore a very useful and versatile tool in the treatment of diseases such as: monitoring blood pressure, detection of atherosclerosis, localization of intracranial hemorrhages, determining bone density, among others. Originality: It describes the necessary components to design an EIT system, as well as the design characteristics depending on the pathology to be visualized. Restrictions: The review focuses on aspects of the performance of an EIT system, depending on the pathology analyzed. Considering the hardware advances, it is possible to increase the acquisition speed (temporal resolution), thus improving the spatial resolution and the quality of the reconstructed image.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Electrical Impedance Tomography: Hardware Fundamentals And Medical Applications

Revelo

2020

ing. Solidar

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“…One of the potential benefits of EIT is that it could be wearable. Currently, there are no wearable EIT systems on the market, but several research prototypes have been developed [13,[91][92][93][94]. These wearable systems have been shown to capture respiration [92,93].…”

Section: Imaging Using Eitmentioning

confidence: 99%

Wearable Bioimpedance Monitoring: Viewpoint for Application in Chronic Conditions

Willemijn¹

2021

JMIR Biomed Eng

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Currently, nearly 6 in 10 US adults are suffering from at least one chronic condition. Wearable technology could help in controlling the health care costs by remote monitoring and early detection of disease worsening. However, in recent years, there have been disappointments in wearable technology with respect to reliability, lack of feedback, or lack of user comfort. One of the promising sensor techniques for wearable monitoring of chronic disease is bioimpedance, which is a noninvasive, versatile sensing method that can be applied in different ways to extract a wide range of health care parameters. Due to the changes in impedance caused by either breathing or blood flow, time-varying signals such as respiration and cardiac output can be obtained with bioimpedance. A second application area is related to body composition and fluid status (eg, pulmonary congestion monitoring in patients with heart failure). Finally, bioimpedance can be used for continuous and real-time imaging (eg, during mechanical ventilation). In this viewpoint, we evaluate the use of wearable bioimpedance monitoring for application in chronic conditions, focusing on the current status, recent improvements, and challenges that still need to be tackled.

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“…Depari et al [16] developed a multi-sensor system consists of an optical photo-plethysmographic sensor and two electrodes for the impedance measurement with Bluetooth connectivity for physical health monitoring during sports activities to provide useful information about the body response to fatigue for athletes [16]. Recently, against the single pair electrode bio-impedance system, Huang et al developed a wireless and portable EIT system with Bluetooth connectivity for the non-invasive and wireless imaging of human lungs during respiration [17]. However, it is impossible to set up these wireless bio-impedance measurements to centrifuges because of the following three problems.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Imaging of Particles Distribution in Centrifugal Particles-Liquid Two-Phase Fields by Wireless Electrical Resistance Tomography (WERT) System

et al. 2019

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A wireless electrical resistance tomography (WERT) system has been developed for the realtime imaging particles distribution in centrifugal particles-liquid two-phase fields. The developed WERT system consists of 1) a constant-current injector; 2) a voltage measurement device; 3) two electrodes switching devices; 4) a wireless transmission device; 5) a microcomputer, and: 6) a host computer. The WERT system provides the advantages of miniaturization and wireless transmission as compared to the conventional wired electrical resistance tomography (ERT) systems. Consequently, we wirelessly imaged the real-time particles distribution in the lab-scale centrifuge in particles-liquid (glass beads-NaCl solution) two-phase flow qualitatively at various measurement positions under various rotational velocities. Based on the images, the particles volume fractions in the centrifugal field are measured quantitatively. The measured particles volume fractions at various measurement positions indicate parabolic separation interfaces between the particles-liquid phases, which are in good agreement with the numerical simulation by Euler-Euler method by an average deviation of 7.21%. As the rotational velocity is increased, particles are pushed outward to be raised along the lab-scale centrifuge because of the increased centrifugal force, which causes a sharper paraboloid interface. INDEX TERMS Real-time measurement, particles distribution, centrifuges, wireless electrical resistance tomography.

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Design of wearable and wireless electrical impedance tomography system

Cited by 23 publications

References 21 publications

Electrical Impedance Tomography: Hardware Fundamentals And Medical Applications

Electrical Impedance Tomography: Hardware Fundamentals And Medical Applications

Wearable Bioimpedance Monitoring: Viewpoint for Application in Chronic Conditions

Real-Time Imaging of Particles Distribution in Centrifugal Particles-Liquid Two-Phase Fields by Wireless Electrical Resistance Tomography (WERT) System

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