Coping with electrode polarization for development of DC-Driven electrical impedance tomography

Hirose, Yoshiyasu; Sagawa, Jun; Sibamoto, Yasuteru; Kukita, Yutaka

doi:10.1016/j.flowmeasinst.2021.102006

Cited by 4 publications

(1 citation statement)

References 26 publications

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“…When only two probes are used, errors due to contact resistance components cannot be avoided, and when measuring with only the DC current flowing, the influence of the capacitance components cannot be included. Additionally, when the DC current is used when measuring impedance, a polarization impedance is formed at the interface between the electrode and the ionic solution, affecting the contact impedance [5]. Since measurements are made once by poking the probe into the wood, the contact resistance changes with each measurement, which also deteriorates the measurement reproducibility.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ambient Temperature on Impedance-Based Physiological Activity Evaluation of Zelkova Tree

Lim,

Kim,

Kim

2024

Applied Sciences

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A system has been developed to remotely, continuously, and quantitatively measure the physiological activity of trees. The developed tree physiological activity monitoring (TPAM) system is equipped with electrical impedance, temperature, and light intensity measurement functions. In the two-contact impedance measurement method used in the previous plant impedance measurement, errors due to the polarization impedance of the electrodes could not be avoided. The developed TPAM system adopted a four-contact measurement method that could avoid polarization impedance errors, and, with it, the long-term monitoring of zelkova trees was performed. The monitoring of seasonal changes was conducted from July to November, and an impedance change pattern that repeated on a daily basis was observed in the short term, and an overall increase in the impedance was observed in the long term. Impedance changes related to daily temperature changes were observed even after all the tree leaves had fallen, meaning that this effect should be excluded when using impedance to evaluate tree vitality. For this reason, the influence of temperature fluctuations was excluded by using only the impedance values at the same daily temperature of 25 degrees from July to November. The analysis results at 25 degrees showed that the tree impedance value increased linearly by 8.7 Ω per day. The results of this series of long-term monitoring and analysis revealed that the ambient temperature must be taken into account in the evaluation of tree physiological activity based on electrical impedance.

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Section: Introductionmentioning

confidence: 99%

Effect of Ambient Temperature on Impedance-Based Physiological Activity Evaluation of Zelkova Tree

Lim,

Kim,

Kim

2024

Applied Sciences

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A numerical study on machine-learning-based ultrasound tomography of bubbly two-phase flows

Wada,

Hirose,

Sibamoto

2024

Ultrasonics

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EIT probe based intraoperative tissue inspection for minimally invasive surgery

Guo,

Zhuang,

et al. 2024

Meas. Sci. Technol.

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Electrical Impedance Tomography (EIT) has become an integral component in the repertoire of medical imaging techniques, particularly due to its non-invasive nature and real-time imaging capabilities. Despite its potential, the application of EIT in Minimally Invasive Surgery (MIS) has been hindered by a lack of specialized electrode probes. Existing designs often compromise between invasiveness and spatial sensitivity: probes small enough for MIS often fail to provide detailed imaging, while those offering greater sensitivity are impractically large for use through a surgical trocar.Addressing this challenge, our study presents a breakthrough in EIT probe design. The open electrode probe we have developed features a line of 16 electrodes, thoughtfully arrayed to balance the spatial demands of MIS with the need for precise imaging. Employing an advanced EIT reconstruction algorithm, our probe not only captures images that reflect the electrical characteristics of the tissues but also ensures the homogeneity of the test material is accurately represented.The versatility of our probe is demonstrated by its capacity to generate high-resolution images of subsurface anatomical structures, a feature particularly valuable during MIS where direct visual access is limited. Surgeons can rely on intraoperative EIT imaging to inform their navigation of complex anatomical landscapes, enhancing both the safety and efficacy of their procedures.Through rigorous experimental validation using ex vivo tissue phantoms, we have established the probe's proficiency. The experiments confirmed the system's high sensitivity and precision, particularly in the critical tasks of subsurface tissue detection and surgical margin delineation.These capabilities manifest the potential of our probe to revolutionize the field of surgical imaging, providing a previously unattainable level of detail and assurance in MIS procedures.

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Coping with electrode polarization for development of DC-Driven electrical impedance tomography

Cited by 4 publications

References 26 publications

Effect of Ambient Temperature on Impedance-Based Physiological Activity Evaluation of Zelkova Tree

Effect of Ambient Temperature on Impedance-Based Physiological Activity Evaluation of Zelkova Tree

A numerical study on machine-learning-based ultrasound tomography of bubbly two-phase flows

EIT probe based intraoperative tissue inspection for minimally invasive surgery

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