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RESIST: Remapping EIT Signals Using Implicit Spatially-Aware Transformer
Proceedings of the 4th Machine Learning for Health Symposium, PMLR 259:86-103, 2025.
Abstract
Electrical impedance tomography (EIT) aims to reconstruct the body’s internal electrical conductivity distribution from surface voltage measurements. This non-invasive, non-ionizing, and cost-effective technique is valuable for medical applications, offering potential for long- term monitoring of lung functionality and condition. However, existing methods of absolute EIT provide blurred tomograms that are difficult to interpret, do not resemble the human topography and are therefore of limited use for clinical applications. We propose RESIST, a new data-driven approach that integrates prior geometry of human bodies and conductivity information by combining an implicit neural network with a transformer model in an encoder-decoder framework. RESIST maps simultaneous EIT measurements from multiple body levels to conductivity values at any coordinate in a 3D body volume. We train RESIST on simulated EIT measurements based on 3D human body CT segmentations. We find that it is robust against distortions in the signal and exact placement of electrodes, correctly infers interpolation laws, and generalizes to real EIT measurements in humans.