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. 2020 Dec;8(24):1688. doi: 10.21037/atm-20-4984

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2020 Annals of Translational Medicine. All rights reserved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0.

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Functional EIT images showing the spatial ventilation distribution during tidal breathing (tidal variation; left) and the regional spirometry parameters (FEV1/FVC; right) in a healthy volunteer (top row) and a patient with chronic obstructive pulmonary disease (COPD) (bottom row). Highly ventilated regions are marked with light blue in the tidal variation maps (left). Scale is in arbitrary units. Regions with a high FEV1/FVC ratio are marked with light yellow in the EIT-based regional spirometry maps (right). Although the spatial ventilation distribution seems unaffected, the regional lung function defect is easily identifiable, especially in the left lung where the regional FEV1/FVC is much lower. FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity.