An Unsupervised Framework for Joint MRI Super Resolution and Gibbs Artifact Removal

• URL: http://arxiv.org/abs/2302.02849v1
• Date: Mon, 6 Feb 2023 15:14:58 GMT
• Title: An Unsupervised Framework for Joint MRI Super Resolution and Gibbs Artifact Removal
• Authors: Yikang Liu, Eric Z. Chen, Xiao Chen, Terrence Chen, Shanhui Sun
• Abstract summary: We propose an unsupervised learning framework for MRI super resolution and Gibbs artifacts removal without using high resolution ground truth. Our method achieves the best SR performance and significantly reduces the Gibbs artifacts. Our method also demonstrates good generalizability across different datasets, which is beneficial to clinical applications.
• Score: 8.609058727152433
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The k-space data generated from magnetic resonance imaging (MRI) is only a finite sampling of underlying signals. Therefore, MRI images often suffer from low spatial resolution and Gibbs ringing artifacts. Previous studies tackled these two problems separately, where super resolution methods tend to enhance Gibbs artifacts, whereas Gibbs ringing removal methods tend to blur the images. It is also a challenge that high resolution ground truth is hard to obtain in clinical MRI. In this paper, we propose an unsupervised learning framework for both MRI super resolution and Gibbs artifacts removal without using high resolution ground truth. Furthermore, we propose regularization methods to improve the model's generalizability across out-of-distribution MRI images. We evaluated our proposed methods with other state-of-the-art methods on eight MRI datasets with various contrasts and anatomical structures. Our method not only achieves the best SR performance but also significantly reduces the Gibbs artifacts. Our method also demonstrates good generalizability across different datasets, which is beneficial to clinical applications where training data are usually scarce and biased.

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