Addition of internal electrodes is beneficial for focused bioimpedance measurements in the lung

Orschulik, Jakob; Hochhausen, Nadine; Czaplik, Michael; Teichmann, Daniel; Leonhardt, Steffen; Walter, Marian

doi:10.1088/1361-6579/aaad45

Cited by 4 publications

(5 citation statements)

References 39 publications

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“…However, when optimizing the electrode positions to specific placement strategies, measurements can be focused to desired regions of interest [16]. In particular, we showed in earlier work that impedance measurements can be focused to specific lung regions [6,7]. For better understanding and readability of this article, the criteria will be repeated in this section.…”

Section: Focusing Of Tetrapolar Impedance Measurementsmentioning

confidence: 99%

“…For local impedance contribution, the behavior is similar: areas with a positive local impedance contribution increase the measured impedance, while areas with a negative contribution decrease the measured transfer impedance. Now, in order to evaluate a tetrapolar electrode configuration with respect to its capability to focus on a specific region of interest (ROI) inside the lung, criteria were defined which are beneficial for focused impedance measurement [6,7]: Let L ROI be the ROI inside the lung. Let further L ROI be the remainder of the lung.…”

Section: Focusing Of Tetrapolar Impedance Measurementsmentioning

confidence: 99%

“…Note, that the local impedance contribution can be determined by multiplying the sensitivity with the reciprocal local conductivity. Figure adapted from [7].…”

Section: A Highmentioning

confidence: 99%

“…In order to avoid results that are only valid in a specific model, the simulation setup in this study is different to the simulation setup used for our previous optimization of the electrode configurations [6,7]. While in the previous study CST has been used for simulation, the simulations in this study were performed in Matlab (MathWorks Inc., USA) using the EIDORS framework [20] and NETGEN [21].…”

Section: Simulation Setupmentioning

confidence: 99%

“…In previous work, we demonstrated that impedance measurements can be focused on desired regions of interest inside the lung by adjusting electrode positions [6,7]. The idea of this work is to utilize these optimized positions to perform a regional impedance analysis using only single tetrapolar measurements for each respective region of interest.…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional pulmonary monitoring using focused electrical impedance measurements

Orschulik

Pokee

Menden

et al. 2018

Journal of Electrical Bioimpedance

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Lung pathologies such as edema, atelectasis or pneumonia are potentially life threatening conditions. Especially in critically ill and mechanically ventilated patients, an early diagnosis and treatment is crucial to prevent an Acute Respiratory Distress Syndrome [1]. Thus, continuous monitoring tool for the lung condition available at the bedside would be highly appreciated. One concept for this is Electrical Impedance Tomography (EIT). In EIT, an electrode belt of typically 16 or 32 electrodes is attached at the body surface and multiple impedance measurements are performed. From this, the conductivity change inside the body is reconstructed in a two-dimensional image. In various studies, EIT proved to be a useful tool for quantifying recruitment maneuvers, the assessment of the ventilation homogeneity, the detection of lung edema or perfusion monitoring [2, 3, 4, 5]. Nevertheless, the main problem of EIT is the low spatial resolution (compared to CT) and the limitation to two dimensional images. In this paper, we try to address the latter issue: Instead of projecting conductivity changes onto a two-dimensional image, we adjust electrode positions to focus single tetrapolar measurements to specific, three-dimensional regions of interest. In earlier work, we defined guidelines to achieve this focusing [6, 7]. In this paper, we demonstrate in simulations and in a water tank experiment that applying these guidelines can help to detect pathologies in specific lung regions.

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Section: Focusing Of Tetrapolar Impedance Measurementsmentioning

confidence: 99%

Section: Focusing Of Tetrapolar Impedance Measurementsmentioning

confidence: 99%

“…Note, that the local impedance contribution can be determined by multiplying the sensitivity with the reciprocal local conductivity. Figure adapted from [7].…”

Section: A Highmentioning

confidence: 99%