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Renyiming Li

2 papers indexed

arxivcs.CV2026-07-02

ProSAC-CT: Progressive Spectral-Anatomical Co-Guided Multi-Stage Diffusion Model for Low-Dose CT Denoising

Xuepeng Liu, Zetong Liu, Renyiming Li, Yan Li, Ruiyu Li, Ruili Li, et al.

Low-dose computed tomography (LDCT) reduces radiation exposure but introduces stronger quantum noise, streak artifacts, and local texture degradation, which can obscure anatomical boundaries and weaken low-contrast structures. Diffusion models are promising for LDCT denoising by…

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arxivcs.CV2026-07-01

AnF-DiffPET: Anatomy- and Frequency-Guided Diffusion for PET/CT Denoising

Xuepeng Liu, Ruili Li, Zetong Liu, Renyiming Li, Yan Li, Yin Dai, et al.

Positron emission tomography (PET) provides essential functional information for disease assessment, however reducing injected activity or acquisition time produces low-dose (LD) PET with stronger count dependent noise and less reliable uptake quantification. Diffusion models off…

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