Structured Design Methodology to Achieve a High SNR Electrical Impedance Tomography

Takhti, Mohammad; Odame, Kofi

doi:10.1109/tbcas.2019.2894157

Cited by 30 publications

(20 citation statements)

References 56 publications

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“…For analog processing, the challenge lies in producing precise wideband I-Q signals, and high-performance analog multipliers. A comparison study was performed in [68] to obtain a matched noise performance, and a processing time of 300 µs for a 10 kHz excitation signal with a noise level of 1 mV 789 . The results revealed that the analog approach requires an eighth order low pass filter for an acceptable settling time and a 14-bit, 2.1 mega samples per second (MSPS) ADC.…”

Section: ) I-q Demodulationmentioning

confidence: 99%

Electrical Impedance Tomography for Biomedical Applications: Circuits and Systems Review

Hanzaee

Jiang

et al. 2021

IEEE Open J. Circuits Syst.

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There has been considerable interest in electrical impedance tomography (EIT) to provide low-cost, radiation-free, real-time and wearable means for physiological status monitoring. To be competitive with other well-established imaging modalities, it is important to understand the requirements of the specific application and determine a suitable system design. This paper presents an overview of EIT circuits and systems including architectures, current drivers, analog front-end and demodulation circuits, with emphasis on integrated circuit implementations. Commonly used circuit topologies are detailed, and tradeoffs are discussed to aid in choosing an appropriate design based on the application and system priorities. The paper also describes a number of integrated EIT systems for biomedical applications, as well as discussing current challenges and possible future directions.

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Section: ) I-q Demodulationmentioning

confidence: 99%

Electrical Impedance Tomography for Biomedical Applications: Circuits and Systems Review

Hanzaee

Jiang

et al. 2021

IEEE Open J. Circuits Syst.

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“…Regarding point (C), even though electrical design comparison for EIT systems was studied in [6] and [7], a quantitatively analyzed relationship between measurement data (which could reflect the hardware performance) and image results, is yet to be established due to the nature of solving an ill-posed inverse problem. Without this relationship, justification of electrical specifications or functions is difficult.…”

Section: Introductionmentioning

confidence: 99%

An Imaged Based Method for Universal Performance Evaluation of Electrical Impedance Tomography Systems

Jiang

Yerworth

et al. 2021

IEEE Trans. Biomed. Circuits Syst.

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This paper describes a simple and reproducible method for universal evaluation of the performance of electrical impedance tomography (EIT) systems using reconstructed images. To address the issues where common electrical parameters are not directly related to the quality of EIT images, based on objective full reference (FR) image quality assessment, the method provides a visually distinguishable hot colormap and two new FR metrics, the global and the more specific 'region of interest'. A passive 16 electrode EIT system using an application specific integrated circuit front-end was used to evaluate the proposed method. The measured results show, both visually and in terms of the proposed FR metrics, the impact on recorded EIT images with different design parameters and non-idealities. The paper also compares the image results of a passive electrode system with a matched 'single variable' active electrode system and demonstrates the merit of an active electrode system for noise interference. A figure of merit based on the FR metrics is proposed.

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“…In this method, harmless electric currents are applied on the subject skin and the resulting electric potentials are recorded with an electrode array [26,27]. From these boundary voltage measurements, it is possible to reconstruct the internal volumetric conductivity distribution and images related to the impedance distribution inside a body, of great clinical interest despite its low resolution [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Fundamentals, Recent Advances, and Future Challenges in Bioimpedance Devices for Healthcare Applications

2019

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This work develops a thorough review of bioimpedance systems for healthcare applications. The basis and fundamentals of bioimpedance measurements are described covering issues ranging from the hardware diagrams to the configurations and designs of the electrodes and from the mathematical models that describe the frequency behavior of the bioimpedance to the sources of noise and artifacts. Bioimpedance applications such as body composition assessment, impedance cardiography (ICG), transthoracic impedance pneumography, electrical impedance tomography (EIT), and skin conductance are described and analyzed. A breakdown of recent advances and future challenges of bioimpedance is also performed, addressing topics such as transducers for biosensors and Lab-on-Chip technology, measurements in implantable systems, characterization of new parameters and substances, and novel bioimpedance applications.

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Structured Design Methodology to Achieve a High SNR Electrical Impedance Tomography

Cited by 30 publications

References 56 publications

Electrical Impedance Tomography for Biomedical Applications: Circuits and Systems Review

Electrical Impedance Tomography for Biomedical Applications: Circuits and Systems Review

An Imaged Based Method for Universal Performance Evaluation of Electrical Impedance Tomography Systems

Fundamentals, Recent Advances, and Future Challenges in Bioimpedance Devices for Healthcare Applications

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