A Structure-Preserving Denoising Diffusion Model for AV45 PET Quantification Without MRI in Alzheimer's Disease Diagnosis. - Xutao Guo; Chenfei Ye; Mingkai Zhang; Xingyu Hao; Yanwu Yang; Yue Yu 001; Heather Ting Ma; Ying Han (Int. J. Imaging Syst. Technol., 2025)