The calculation of electrical impedance tomography based silent spaces requires individual thorax and lung contours

Yang, Lin; Fu, Feng; Frerichs, Inéz; Möeller, Knut; Dai, Meng; Zhao, Zhanqi

doi:10.1088/1361-6579/ac8bc2

Cited by 3 publications

(8 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This method requires the definition of lung regions in the EIT images, which is a difficult issue in EIT and critical for the correct interpretation. Individualized regions are needed [8] which has not been done so far. A new method has recently been proposed that might improve the identification of lung regions-of-interest [9 ▪ ].…”

Section: How Can Electrical Impedance Tomography Help In Setting Posi...mentioning

confidence: 99%

Setting positive end-expiratory pressure by using electrical impedance tomography

Frerichs,

Schädler,

Becher

2023

Current Opinion in Critical Care

Self Cite

View full text Add to dashboard Cite

Purpose of review This review presents the principles and possibilities of setting positive end-expiratory pressure (PEEP) using electrical impedance tomography (EIT). It summarizes the major findings of recent studies where EIT was applied to monitor the effects of PEEP on regional lung function and to guide the selection of individualized PEEP setting. Recent findings The most frequent approach of utilizing EIT for the assessment of PEEP effects and the PEEP setting during the time period from January 2022 till June 2023 was based on the analysis of pixel tidal impedance variation, typically acquired during stepwise incremental and/or decremental PEEP variation. The most common EIT parameters were the fraction of ventilation in various regions of interest, global inhomogeneity index, center of ventilation, silent spaces, and regional compliance of the respiratory system. The studies focused mainly on the spatial and less on the temporal distribution of ventilation. Contrast-enhanced EIT was applied in a few studies for the estimation of ventilation/perfusion matching. Summary The availability of commercial EIT devices resulted in an increase in clinical studies using this bedside imaging technology in neonatal, pediatric and adult critically ill patients. The clinical interest in EIT became evident but the potential of this method in clinical decision-making still needs to be fully exploited.

show abstract

Section: How Can Electrical Impedance Tomography Help In Setting Posi...mentioning

confidence: 99%

Setting positive end-expiratory pressure by using electrical impedance tomography

Frerichs,

Schädler,

Becher

2023

Current Opinion in Critical Care

Self Cite

View full text Add to dashboard Cite

show abstract

“…Medical images of patients (such as CT images) can provide additional spatial information on patient geometry for the external boundary and location of organs. Recent work has shown that using a custom mesh can improve EIT estimates of lung inhomogeneity (Yang et al, 2021) in ARDS patients, but generating custom meshes manually is not always feasible, and automatic segmentation of CT images is not always reliable. This chapter uses diagnostic CT images from 4 subjects to design and test a tool to create custom meshes for each patient.…”

Section: Introductionmentioning

confidence: 99%

“…Higher spatial accuracy in identified organs and regions of interest could allow for easier isolation of the perfusion signal, and more accurate measures of perfusion and ventilation with EIT. Motivated by the work presented by Yang et al (2021), the work in this chapter focuses using custom meshes to improve measures of ventilation in the lungs. We hypothesize this might be able to better guide ventilation and improve treatment outcomes for patients with acute respiratory distress syndrome (ARDS).…”

Section: Introductionmentioning

confidence: 99%

“…The correct lung boundary is also required to calculate metrics like GI index (Zhao et al, 2009). Incorrectly modelling the boundary and lung area when investigating regional homogeneity can also lead to an incorrect GI estimate (Yang et al, 2021). Yang et al (2021) found that a mesh with custom segmented external and lung boundaries was more sensitive to changes in lung condition using GI compared with generic models.…”

Section: Introductionmentioning

confidence: 99%

“…Incorrectly modelling the boundary and lung area when investigating regional homogeneity can also lead to an incorrect GI estimate (Yang et al, 2021). Yang et al (2021) found that a mesh with custom segmented external and lung boundaries was more sensitive to changes in lung condition using GI compared with generic models. This suggests a custom mesh with more defined lung regions may also improve sensitivity to lung-based pulsatility and improve measures of perfusion.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electrical Impedance Tomography for Perfusion Imaging and Monitoring

Stowe¹

View full text Add to dashboard Cite

Electrical impedance tomography (EIT) is a medical imaging technology that uses boundary electrodes to inject stimulus currents and measure the resulting potential distributions. These potentials are measured using electrodes which are in turn used to reconstruct conductivity changes within the body.EIT has been studied for its ability to image both the flow of blood and the delivery of blood to a tissue (perfusion). However, cardiac-related signals are challenging to image accurately due to their small amplitude and the limited sensitivity of EIT systems to impedance changes deep in the body. This thesis presents techniques to improve perfusion imaging with EIT by generating more accurate meshes and using internal electrodes to obtain higher sensitivity in the centre of the body. This work develops a tool to generate accurate, customized meshes from diagnostic computed tomography (CT) images, and a technique to reconstruct images with internal electrodes. Custom models reconstructed the location of impedance changes due to ventilation with higher accuracy, and internal electrodes yielded an increase in internal sensitivity over traditional external configurations. Shifting the position of electrodes on an internal probe by as little as 1% of the tank radius in simulation created artefacts in images reconstructed using existing approaches without motion correction. A novel technique to correct for probe motion is presented that improved reconstruction accuracy and reduced background noise compared to existing techniques. The presented work contributes to increasing internal sensitivity of EIT measurements and demonstrates that refined meshes and internal electrodes may improve measures of perfusion and help to make EIT a viable tool for continuous perfusion monitoring at the bedside.iii Thank you to Dr. Étienne Fortin-Pellerin and the team at Université de Sherbrooke for their support with so many experiments, and welcoming me into their lab.I would also like to thank Dr. Alistair Boyle for his valuable insights into the field of EIT and my colleagues who have made my time at Carleton so enjoyable.Finally, a huge thank you to my family. My parents, Marlys and Doug, and my sisters, Alyssa and Caitlyn have supported this work in so many ways, both in the workshop helping with prototypes and proofreading. A special thank you to my partner Sana for her patience, help and support along this journey.

show abstract

Electrical impedance tomography monitoring in adult ICU patients: state-of-the-art, recommendations for standardized acquisition, processing, and clinical use, and future directions

Scaramuzzo,

Pavlovsky,

Adler

et al. 2024

Crit Care

View full text Add to dashboard Cite

Electrical impedance tomography (EIT) is an emerging technology for the non-invasive monitoring of regional distribution of ventilation and perfusion, offering real-time and continuous data that can greatly enhance our understanding and management of various respiratory conditions and lung perfusion. Its application may be especially beneficial for critically ill mechanically ventilated patients. Despite its potential, clear evidence of clinical benefits is still lacking, in part due to a lack of standardization and transparent reporting, which is essential for ensuring reproducible research and enhancing the use of EIT for personalized mechanical ventilation. This report is the result of a four-day expert meeting where we aimed to promote the consistent and reliable use of EIT, facilitating its integration into both clinical practice and research, focusing on the adult intensive care patient. We discuss the state-of-the-art regarding EIT acquisition and processing, applications during controlled ventilation and spontaneous breathing, ventilation-perfusion assessment, and novel future directions.

show abstract

The calculation of electrical impedance tomography based silent spaces requires individual thorax and lung contours

Cited by 3 publications

References 29 publications

Setting positive end-expiratory pressure by using electrical impedance tomography

Setting positive end-expiratory pressure by using electrical impedance tomography

Electrical Impedance Tomography for Perfusion Imaging and Monitoring

Electrical impedance tomography monitoring in adult ICU patients: state-of-the-art, recommendations for standardized acquisition, processing, and clinical use, and future directions

Contact Info

Product

Resources

About