Towards Fast Biomechanical Modeling of Soft Tissue Using Neural Networks
Meister F, Passerini T, Mihalef V, Tuysuzoglu A, Maier A, Mansi T (2018)
Publication Language: English
Publication Type: Conference contribution, Abstract of a poster
Publication year: 2018
Conference Proceedings Title: Medical Imaging meets NeurIPS Workshop 2018
Event location: Montreal, Canada
Abstract
To date, the simulation of organ deformations for applications like therapy planning or image-guided interventions is calculated by solving the elastodynamics equations. While efficient solvers have been proposed for fast simulations, methods that are both real-time and accurate are still an open challenge. An ideal, interactive solver would be able to provide physically and numerically accurate results at high frame rate, which requires efficient force computation and time integration. Towards this goal, we explore in this paper for the first time the use of neural networks to directly learn the underlying biomechanics. Given a 3D mesh of a soft tissue segmented from medical images, we train a neural network to predict vertex-wise accelerations for a large time step based on the current state of the system. The model is trained using the deformation of a bar under torsion, and evaluated on different motions, geometries, and hyperelastic material models. For predictions of ten times the original time step we observed a mean error of 0.017mm ± 0.014 (0.032) at a mesh size of 50mm x 50mm x 100mm. Predictions at 20dt yield an error of 2.10mm ± 1.73 (4.37) and by further increasing the prediction time step the maximum error rises to 38.3mm due to an artificial stiffening. In all experiments our proposed method stayed stable, while the reference solver fails to converge. Our experiments suggest that it is possible to directly learn the mechanical simulation and open further investigations for the direct application of machine learning to speed-up biophysics solvers.
Authors with CRIS profile
Felix Meister
Lehrstuhl für Informatik 5 (Mustererkennung)
Andreas Maier
Lehrstuhl für Informatik 5 (Mustererkennung)
Involved external institutions
United States (USA) (US)
Germany (DE)How to cite
APA:
Meister, F., Passerini, T., Mihalef, V., Tuysuzoglu, A., Maier, A., & Mansi, T. (2018). Towards Fast Biomechanical Modeling of Soft Tissue Using Neural Networks. Poster presentation at Medical Imaging meets NeurIPS Workshop @ Neural Information Processing Systems (NeurIPS) 2018, Montreal, Canada.
MLA:
Meister, Felix, et al. "Towards Fast Biomechanical Modeling of Soft Tissue Using Neural Networks." Presented at Medical Imaging meets NeurIPS Workshop @ Neural Information Processing Systems (NeurIPS) 2018, Montreal, Canada 2018.
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