Thoracic EIT in 3D: experiences and recommendations.

Grychtol, Bartłomiej; Schramel, Johannes Peter; Braun, Fabian; Riedel, Thomas; Auer, Ulrike; Mosing, Martina; Braun, Christina; Waldmann, Andreas D; Böhm, Stephan H; Adler, Andy (2019). Thoracic EIT in 3D: experiences and recommendations. Physiological measurement, 40(7), 074006. Institute of Physics Publishing IOP 10.1088/1361-6579/ab291d

[img]
Preview
Text
12_GrychtolB_Thoracic_EIT_in_3D_-_experiences_and_recommendations_PhysiolMeas2019.pdf - Accepted Version
Available under License Publisher holds Copyright.

Download (1MB) | Preview

OBJECTIVE

In EIT applications to the thorax, a single electrode plane has typically been used to reconstruct a transverse 2D 'slice'. However, such images can be misleading as EIT is sensitive to contrasts above and below the electrode plane, and ventilation and aeration inhomogeneities can be distributed in complex ways. Using two (or more) electrode planes, 3D EIT images may be reconstructed, but 3D reconstructions are currently little used in thoracic EIT. In this paper, we investigate an incremental pathway towards 3D EIT reconstructions, using two electrode planes to calculate improved transverse slices as an intermediate step. We recommend a specific placement of electrode planes, and further demonstrate the feasibility of multi-slice reconstruction in two species.

APPROACH

Simulations of the forward and reconstructed sensitivities were analysed for two electrode planes using a 'square' pattern of electrode placement as a function of two variables: the stimulation and measurement 'skip', and the electrode plane separation. Next, single- versus two-plane measurements were compared in a horse and in human volunteers. We further show the feasibility of 3D reconstructions by reconstructing multiple transverse and, unusually, frontal slices during ventilation.

MAIN RESULTS

Using two electrode planes leads to a reduced position error and improvement in off-plane contrast rejection. 2D reconstructions from two-plane measurements showed better separation of lungs, as compared to the single plane measurements which tend to push contrasts in the center of the image. 3D reconstructions of the same data show anatomically plausible images, inside as well as outside the volume between the two electrode planes.

SIGNIFICANCE

Based on the results, we recommend EIT electrode planes separated by less than half of the minimum thoracic dimension with a 'skip 4' pattern and 'square' placement to produce images with good slice selectivity.

Item Type:

Journal Article (Review Article)

Division/Institute:

04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine
04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine > Paediatric Intensive Care

UniBE Contributor:

Riedel, Thomas

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0967-3334

Publisher:

Institute of Physics Publishing IOP

Language:

English

Submitter:

Anette van Dorland

Date Deposited:

28 Apr 2022 09:20

Last Modified:

28 Apr 2022 09:20

Publisher DOI:

10.1088/1361-6579/ab291d

PubMed ID:

31189141

BORIS DOI:

10.48350/169571

URI:

https://boris.unibe.ch/id/eprint/169571

Actions (login required)

Edit item Edit item
Provide Feedback