CEST-KAN: Kolmogorov-Arnold Networks for CEST MRI Data Analysis

TL;DR

This paper introduces Kolmogorov-Arnold Networks (KAN) as a novel method for analyzing CEST MRI data, demonstrating superior accuracy and reliability over traditional and neural network approaches in generating contrast maps.

Contribution

The study is the first to apply KAN to CEST MRI data analysis, showing its advantages over MLP models and conventional methods in accuracy and robustness.

Findings

KAN outperforms MLP in accuracy and extrapolation.

KAN generates CEST maps comparable to traditional methods.

Higher Pearson correlation coefficients with KAN.

Abstract

Purpose: This study aims to propose and investigate the feasibility of using Kolmogorov-Arnold Network (KAN) for CEST MRI data analysis (CEST-KAN). Methods: CEST MRI data were acquired from twelve healthy volunteers at 3T. Data from ten subjects were used for training, while the remaining two were reserved for testing. The performance of multi-layer perceptron (MLP) and KAN models with the same network settings were evaluated and compared to the conventional multi-pool Lorentzian fitting (MPLF) method in generating water and multiple CEST contrasts, including amide, relayed nuclear Overhauser effect (rNOE), and magnetization transfer (MT). Results: The water and CEST maps generated by both MLP and KAN were visually comparable to the MPLF results. However, the KAN model demonstrated higher accuracy in extrapolating the CEST fitting metrics, as evidenced by the smaller validation loss during training and smaller absolute error during testing. Voxel-wise correlation analysis showed that all four CEST fitting metrics generated by KAN consistently exhibited higher Pearson coefficients than the MLP results, indicating superior performance. Moreover, the KAN models consistently outperformed the MLP models in varying hidden layer numbers despite longer training time. Conclusion: In this study, we demonstrated for the first time the feasibility of utilizing KAN for CEST MRI data analysis, highlighting its superiority over MLP in this task. The findings suggest that CEST-KAN has the potential to be a robust and reliable post-analysis tool for CEST MRI in clinical settings.