Graph convolutional networks enable fast hemorrhagic stroke monitoring with electrical impedance tomography

作     者：Toivanen, J. Kolehmainen, V. Paldanius, A. Hänninen, A. Hauptmann, A. Hamilton, S.J. 

作者机构：Department of Technical Physics University of Eastern Finland KuopioFI-70210 Finland Faculty of Medicine and Health Technology Tampere University Tampere Finland Department of Mathematical and Statistical Sciences Marquette University MilwaukeeWI53233 United States Research Unit of Mathematical Sciences University of Oulu Oulu Finland Department of Computer Science University College London London United Kingdom 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2024年

核心收录：

主　　题：Image quality 

摘      要：Objective: To develop a fast image reconstruction method for stroke monitoring with electrical impedance tomography with image quality comparable to computationally expensive nonlinear model-based methods. Methods: A post-processing approach with graph convolutional networks is employed. Utilizing the flexibility of the graph setting, a graph U-net is trained on linear difference reconstructions from 2D simulated stroke data and applied to fully 3D images from realistic simulated and experimental data. An additional network, trained on 3D vs. 2D images, is also considered for comparison. Results: Post-processing the linear difference reconstructions through the graph U-net significantly improved the image quality, resulting in images comparable to, or better than, the time-intensive nonlinear reconstruction method (a few minutes vs. several hours). Conclusion: Pairing a fast reconstruction method, such as linear difference imaging, with post-processing through a graph U-net provided significant improvements, at a negligible computational cost. Training in the graph framework vs classic pixel-based setting (CNN) allowed the ability to train on 2D cross-sectional images and process 3D volumes providing a nearly 50x savings in data simulation costs with no noticeable loss in quality. Significance: The proposed approach of post-processing a linear difference reconstruction with the graph U-net could be a feasible approach for on-line monitoring of hemorrhagic stroke. Copyright © 2024, The Authors. All rights reserved.