An Uncertainty Aided Framework for Learning based Liver $T_1ρ$ Mapping and Analysis
This work addresses the need for trustworthy quantitative MRI in clinical liver pathology assessment, though it is incremental as it builds on existing deep learning methods for medical imaging.
The paper tackled the problem of accelerating quantitative liver T1ρ mapping using deep learning by proposing an uncertainty-aided framework to estimate and utilize prediction uncertainty, achieving a relative mapping error of less than 3% and reducing it further to 2.60% with uncertainty-based refinement.
Objective: Quantitative $T_1ρ$ imaging has potential for assessment of biochemical alterations of liver pathologies. Deep learning methods have been employed to accelerate quantitative $T_1ρ$ imaging. To employ artificial intelligence-based quantitative imaging methods in complicated clinical environment, it is valuable to estimate the uncertainty of the predicated $T_1ρ$ values to provide the confidence level of the quantification results. The uncertainty should also be utilized to aid the post-hoc quantitative analysis and model learning tasks. Approach: To address this need, we propose a parametric map refinement approach for learning-based $T_1ρ$ mapping and train the model in a probabilistic way to model the uncertainty. We also propose to utilize the uncertainty map to spatially weight the training of an improved $T_1ρ$ mapping network to further improve the mapping performance and to remove pixels with unreliable $T_1ρ$ values in the region of interest. The framework was tested on a dataset of 51 patients with different liver fibrosis stages. Main results: Our results indicate that the learning-based map refinement method leads to a relative mapping error of less than 3% and provides uncertainty estimation simultaneously. The estimated uncertainty reflects the actual error level, and it can be used to further reduce relative $T_1ρ$ mapping error to 2.60% as well as removing unreliable pixels in the region of interest effectively. Significance: Our studies demonstrate the proposed approach has potential to provide a learning-based quantitative MRI system for trustworthy $T_1ρ$ mapping of the liver.