High-Frequency Space Diffusion Models for Accelerated MRI

  title={High-Frequency Space Diffusion Models for Accelerated MRI},
  author={Chentao Cao and Zhuoxu Cui and Shaonan Liu and Dong Liang and Yanjie Zhu},
Denoising diffusion probabilistic models (DDPMs) have been shown to have superior performances in MRI reconstruction. From the perspective of continuous stochastic differential equations (SDEs), the reverse process of DDPM can be seen as maximizing the energy of the reconstructed MR image, leading to SDE sequence divergence. For this reason, a modified high-frequency DDPM model is proposed for MRI reconstruction. From its continuous SDE viewpoint, termed high-frequency space SDE (HFS-SDE), the… 

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