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Deep learning for restoring MPI system matrices using simulated training data
Artyom Tsanda1,2, Sarah Reiss1,2, Konrad Scheffler1,2
1Institute for Biomedical Imaging, Hamburg University of Technology, Hamburg, Germany.
Physics in Medicine and Biology
|April 15, 2026
Summary
Physics-based simulated data can train deep learning models for magnetic particle imaging system matrix restoration tasks. This approach overcomes data scarcity, enabling improved denoising, accelerated calibration, upsampling, and inpainting for enhanced imaging capabilities.
Area of Science:
- Medical Imaging
- Computational Physics
- Machine Learning
Background:
- Magnetic particle imaging (MPI) system matrix calibration is crucial for accurate tracer distribution reconstruction.
- Current calibration methods are time-consuming and susceptible to noise, limiting MPI performance.
- Deep learning models show promise for system matrix restoration but require extensive training data, which is often scarce.
Purpose of the Study:
- To evaluate the efficacy of using physics-based simulated system matrices for training deep learning models.
- To assess the generalization of these trained models to real-world measured data for various restoration tasks.
- To address the challenge of limited curated training data in deep learning for MPI.
Main Methods:
- A comprehensive dataset of system matrices was generated using an extended equilibrium magnetization model, incorporating uniaxial anisotropy.
- Simulations included 2D and 3D trajectories, various particle/scanner/calibration parameters, and injected background noise.
- Deep learning models were trained on simulated data and compared against classical methods for denoising, upsampling, accelerated calibration, and inpainting.
Main Results:
- Deep learning models trained on simulated data demonstrated generalization to measured data across all tested tasks.
- For denoising, models significantly outperformed traditional methods in peak signal-to-noise ratio (PSNR) and structural similarity index measure (SSIM).
- Performance varied for other tasks like upsampling, with some models showing robustness to noise in accelerated calibration and inpainting.
Conclusions:
- Training deep learning models with simulated data effectively mitigates the data scarcity issue in magnetic particle imaging.
- This approach enables the development of advanced restoration methods that surpass current measurement limitations.
- Simulated data provides a viable solution for pre-training large-scale deep learning models in MPI.
