STsim: An Efficient Diffusion-Based Model for Generating Spot Images from Gene Expression in Spatial Transcriptomics. - Pengyu Sun; Thi An Le; Xinzhen Yu; Yi Gao 002; Ha-Nam Nguyen; Thi-Hau Nguyen; Trung-Nghia Vu; Tian Mou (BIBM, 2025)