arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2301.03027eess.IVcs.CVcs.LG
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基于退火分数的MR运动补偿扩散模型

Annealed Score-Based Diffusion Model for MR Motion Artifact Reduction

Korea Advanced Institute of Science and Technology (KAIST)(韩国科学技术院);Chungnam National University Hospital(忠南大学医院);Chungnam National University College of Medicine(忠南大学医学院)

Gyutaek Oh, Jeong Eun Lee, Jong Chul Ye

摘要:

运动伪影的存在降低了图像质量,给诊断带来困难,如何消除运动伪影是磁共振成像领域的重要研究课题之一。最近,已经研究了许多深度学习方法来减少运动伪影。不幸的是,大多数现有的模型都是以监督的方式训练的,需要成对的运动损坏和无运动图像,或者基于严格的运动损坏模型,这限制了它们在现实世界中的使用。为了解决这个问题,在这里,我们提出了一个退火的分数为基础的扩散模型的MRI运动伪影减少。具体来说,我们训练一个基于分数的模型,只使用无运动的图像,然后通过反复应用正向和反向扩散过程来去除运动伪影,以逐渐实现低频数据的一致性。实验结果证明,该方法成功地减少了模拟和体内运动伪影,优于最先进的深度学习方法。

英文摘要:

Motion artifact reduction is one of the important research topics in MR imaging, as the motion artifact degrades image quality and makes diagnosis difficult. Recently, many deep learning approaches have been studied for motion artifact reduction. Unfortunately, most existing models are trained in a supervised manner, requiring paired motion-corrupted and motion-free images, or are based on a strict motion-corruption model, which limits their use for real-world situations. To address this issue, here we present an annealed score-based diffusion model for MRI motion artifact reduction. Specifically, we train a score-based model using only motion-free images, and then motion artifacts are removed by applying forward and reverse diffusion processes repeatedly to gradually impose a low-frequency data consistency. Experimental results verify that the proposed method successfully reduces both simulated and in vivo motion artifacts, outperforming the state-of-the-art deep learning methods.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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