Dear MarMamers We would like to share our new open-access publication that is aimed at developing a non-invasive method (Electrical Impedance Tomography) to evaluate lung function, mechanics, and regional lung filling in mammals while submerged in water. EIT is a non-invasive, radiation-free imaging technique that uses low-frequency electrical currents to visualize lung ventilation and has applications in both human and veterinary medicine for monitoring and diagnosis of respiratory function. The paper is open-access and can be found at the doi link below. We also provide a link to the final submitted version. If you have any questions, or have problems downloading a pdf, please do not hesitate to contact.
Sincerely, Andreas Title: In-water electrical impedance tomography: EIT and the sea Journal: Physiological Measurement Authors: Andy Adler, Tarek El Harake, Martina Mosing and Andreas Fahlman doi: 10.1088/1361-6579/adb82c Abstract: Objective. Electrical impedance tomography (EIT) has shown the ability to provide clinically useful functional information on ventilation in humans and other land mammals. We are motivated to use EIT with sea mammals and human divers, since EIT could provide unique information on lung ventilation that can help address diver performance and safety, and veterinary and behavioral questions. However, in-water use of EIT is challenging, primarily because sea water is more conductive than the body. Approach. We first address this issue by modeling the in-water component and evaluating image reconstruction algorithms. Main results. EIT is able to produce reasonable images if an outer insulating layer allows a water layer thickness <2% of the body radius. We next describe the design of custom EIT belts with an outer neoprene insulator to minimize current leakage. We show example underwater EIT recordings in human and dolphin subjects. Significance. We demonstrate in-water EIT is feasible with appropriate techniques. Link to published paper: https://iopscience.iop.org/article/10.1088/1361-6579/adb82c https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.sce.carleton.ca%2Ffaculty%2Fadler%2Fpublications%2F2025%2Fadler-2025-in-water-EIT.pdf&data=05%7C02%7Cafahlman%40whoi.edu%7C7bdb762323ee4b294b9008dd704a51af%7Cd44c5cc6d18c46cc8abd4fdf5b6e5944%7C0%7C0%7C638790186695269465%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=Kq6b6Ag5Fn9z7SkSI5HGjYSBJ%2BNcJNstbGwsleGmzSI%3D&reserved=0<https://www.sce.carleton.ca/faculty/adler/publications/2025/adler-2025-in-water-EIT.pdf>
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