Peer Review Statementdoi: 10.1088/1742-6596/3014/1/011002pmid: N/A
All papers published in this volume have been reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.• Type of peer review: Double Anonymous• Conference submission management system: Morressier• Number of submissions received: 38• Number of submissions sent for review: 35• Number of submissions accepted: 34• Acceptance Rate (Submissions Accepted / Submissions Received × 100): 89.5• Average number of reviews per paper: 2• Total number of reviewers involved: 13• Contact person for queries:Name: César GonzálezEmail: [email protected]: Instituto Politécnico Nacional-México
AixTOM - The mfEIT research platform from AachenJacobs, P U; Menden, T; Leonhardt, S
doi: 10.1088/1742-6596/3014/1/012025pmid: N/A
This paper presents an in-house developed Electrical Impedance Tomography (EIT) device designed specifically for research applications. It offers fully configurable current injection and voltage measurement patterns, along with up to five simultaneous, adjustable excitation frequencies. The system is built for straightforward expansion in both hardware and software. While not classified as a medical device, it ensures safe human use through galvanic isolation and a hard-wired overcurrent protection mechanism.
Comparison of qualitative and quantitative impedance tomography image reconstruction methods.Robledo Ayala, Alejandro Israel; Lopez, Marcos Gutiérrez; Gutiérrez Gnecchi, José Antonio; Olivares Rojas, Juan Carlos; Archundia, Enrique Reyes; Melchor Uceda, Iran Arane
doi: 10.1088/1742-6596/3014/1/012021pmid: N/A
In recent years, electrical impedance tomography (EIT) has gained significant relevance in research, agriculture, and biomedicine. To meet the specific needs of each application, specialized systems and algorithms have been developed. Evaluating their performance is crucial for their improvement and effective application. This work presents a methodology for the evaluation of EIT systems using mathematical tools such as the Pearson Correlation Coefficient (PCC) and Root Mean Square Error (RMSE). These metrics quantify the similarity and accuracy of qualitative and quantitative reconstruction algorithms using synthetic data generated in COMSOL Multiphysics. The results show that the PCC ranges from 0.8166 to 0.9686, while the RMSE varies between 0.12456 and 0.14827, depending on the electrical properties of the material and the domain. This methodology establishes a framework for integrating new evaluation tools, contributing to the advancement of EIT systems and reconstruction algorithms.
Effect of applied pressure on bioimpedance measurements of ex-vivo human lung tissueValdiviezo, Zenia; Murphy, Ethan K.; Suratwala, Safina; Phillips, Joseph; Finley, David; Ferrari-Light, Dana; Lu, Liang; Fay, Kayla; Halter, Ryan J.
doi: 10.1088/1742-6596/3014/1/012010pmid: N/A
The contrast in the electrical properties of healthy and malignant lung tissue could provide a methodology for intraoperative surgical margin assessment to reduce positive margins and improve clinical outcomes. However, the tissue is often compressed and deformed during intraoperative procedures. This study explores the impact applied pressure has on the electrical properties of ex vivo human lung tissue. Impedance spectra spanning 100 Hz to 10 MHz were recorded from freshly resected lung tissue specimens including lesion (n=3), perilesion (n=3), and healthy (n=4) samples, under an applied load and converted into resistivity. A linear regression was performed for each resistivity-pressure curve for all tissue types. A significant difference (p<0.05) was found between regression coefficients of lesion and perilesion tissues and both regression coefficient and constant for lesion and healthy tissue. No significant differences were found between the perilesion and healthy tissue coefficient or constant. These finding suggests that resistivity increases with pressure at different rates for malignant and healthy tissue that may be sufficient for surgical margin assessment.
Impedance sensor based on carbon paste electrodes to monitor conductivity changes in electrolytesUc-Martín, Jorge A.; Guadarrama-Santana, Asur; Ramírez-Chavarría, Roberto G.
doi: 10.1088/1742-6596/3014/1/012028pmid: N/A
We present a prototype of an unmodified carbon paste electrode sensor (SCPE) with the potential to distinguish electrolyte conductivity changes. Electrodes are placed in a syringe tube that acts as a holder in a coplanar configuration. This design allows for a portable sensor that fits into different electrolyte-holding containers. As proof of concept, a potassium chloride (KCl) suspension was used in a concentration range of 0 to 35 mgL−1. The operating frequency of the prototype was determined by impedance spectroscopy (IS) analysis, where the sensor presented good sensitivity and the best results. The morphological characterization of the transducer surface, performed by field emission scanning electron microscopy (FeSEM), shows a typical carbon paste surface. Finally, this simple, portable, and reusable design, combined with its low cost, takes advantage of the properties of graphite, provides information in a relatively short time, and has potential in quality control applications.
Evaluation of Electrical Impedance Tomography Electrodes in the Measurement of Biceps Muscle ActivityMelchor-Uceda, I A; Gutiérrez-Medina, J D; Gutiérrez-Gnecchi, J A; González-Vázquez, A; Reyes-Archundia, E; Olivares-Rojas, J C; Mendéz-Patiño, A
doi: 10.1088/1742-6596/3014/1/012014pmid: N/A
Electrical impedance tomography (EIT) is a non-invasive imaging technique used to assess the electrical conductivity of biological tissues which in turn can be related to other physiological tissue properties such as hydration status, vascular inflow, tissue composition and pathological conditions. The ability of EIT to provide information in real time, has sparked interest in rehabilitation, sport science and clinical diagnostics applications. Thus, EIT emerges as a suitable measurement solution to detect muscle activation patterns from changes in the electrical conductivity due to muscle activity. EIT measurements rely on the use of a set of electrodes placed in contact with the skin around the muscle to be studied. Therefore, there is a compromise between electrode size, shape and material to yield the best quality of measurements while allowing placing sufficient electrodes for EIT imaging. In this paper, the authors evaluate the performance of different types of reusable electrodes in terms of measurement stability, noise, response to muscle contraction and root mean square error. The results suggest that the shape and material of the electrode significantly influence the quality of the bioimpedance measurements and the reconstructed images. Stainless steel resulted in the most suitable option for delivering consistent and reliable bioimpedance measurements for EIT image reconstruction. e image reconstruction.
Agreement between the results of body composition analysis from two electrical bioimpedance devicesNeri, M; Morales, L; Becerril, Y
doi: 10.1088/1742-6596/3014/1/012033pmid: N/A
Electrical bioimpedance analysis (BIA) has become the most widely used technique to assess body composition (BC) due to its accessibility and practicality. However, it is necessary to validate these emerging devices to guarantee sensitivity and specificity. The objective was to analyze the concordance between the results of BC analysis between two bioelectrical impedance devices. Values equivalent to the concordance correlation coefficient (CCC) for muscle mass (MM), body fat (BF) percentage and bone mineral content (BMC) estimated by the BIODY XPERTZM3® and TANITA® BC601 devices presented magnitudes between 0.992, 0.979 and 0.928 respectively, while body water (BW) percentage was less than other indicators (0.869). MM was overestimated and BF, BW and BMC were underestimated. CCC and Bland-Altman plot indicate that the results obtained by both devices can be considered comparable.
Assessment of peripheral nerve injury with impedance neurography: a pilot in silico studyFabregas, Albert; McKellar, Shaun; Rutkove, Seward; Mandeville, Ross; Sanchez, Benjamin
doi: 10.1088/1742-6596/3014/1/012001pmid: N/A
Peripheral nerve injuries (PNIs) present a significant clinical challenge, with current diagnostic tools often falling short in guiding optimal surgical management. Traditional intraoperative techniques, such as recording nerve action potentials, are rarely utilized due to technical limitations including poor signal quality, artifact interference, and lengthy procedure times. To address this gap, we propose electrical impedance neurography (ING), a technology for real-time, intraoperative assessment of nerve health. In this pilot simulation study, we aim to evaluate the capability of ING to detect the location and quantify nerve injury severity using PNI. ING technology could assist intraoperative nerve assessment by providing insights into nerve integrity, improving surgical outcomes, and ultimately enhancing recovery for patients with traumatic nerve injuries.