The synthesis of high-energy CT images from low-energy CT images using an improved cycle generative adversarial network - Zhou, Haojie; Liu, Xinfeng; Wang, Haiyan; Chen, Qihang; Wang, Rongpin; Pang, Zhi-Feng; Zhang, Yong; Hu, Zhanli (Quantitative Imaging in Medicine and Surgery, 2021)