High-Frequency Space Diffusion Models for Accelerated MRI. (arXiv:2208.05481v2 [eess.IV] UPDATED)

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 energy concentrated low-frequency part
of the MR image is no …

arxiv diffusion diffusion models space