Generating Synthetic 4DCT From 4DCBCT for Lung Tumor Adaptive Photon and Proton Therapy Using a Unet Attention-Guided CycleGAN With Structure-Consistency Loss. - Xiangyu Zhang; Xinyu Song; Jing Li; Lian Duan; Guangyu Wang; Weige Wei; Yongchang Wu; Sen Bai; Guangjun Li (IEEE Trans. Computational Imaging, 2025)