Qi Zhang, Jianpeng Zhang, Weiwei Cao, Zilin Lu, Wanxing Chang, Haonan Ding, Cao Chen, Zhi Li, Xing Xue, Sinuo Wang, Shaoteng Zhang, Yutong Xie, Yong Xia, Qi Wu, Zhongyi Shui, Xi Li, Zhilin Zheng, Yanjie Zhou, Tony C W Mok, Yingda Xia, Hongkan Wang, Xianghua Ye, Tao Ma, Jie Peng, Xiaoguang Wang, Jian Ding, Yuming Gao, Huazhen Ye, Yiping Liu, Dongjie Chen, Zhaomin Ni, Jianwen Ning, Wei Zhang, Jian Liu, Chaohui Yu, Shenghong Ju, Jianfeng Zhang, Wenbo Xiao, Ling Zhang, Tingbo Liang
Artificial intelligence (AI) in radiology aspires to deliver expert-level diagnosis across diverse clinical tasks, yet existing supervised strategies remain limited in scope. We developed RADAR, a generalist vision-language model trained on more than 400,000 contrast-enhanced abdominal computed tomography (CT) examinations and 15 million anatomy-wise image-text pairs, learning directly from clinical reports without manual annotation. Throughout internal and external evaluations across multiple centers and varied clinical scenarios, RADAR achieved high diagnostic performance and robust generalization for 18 anatomical structures and 146 imaging findings. In a reader study, RADAR assistance increased the diagnostic sensitivity of 26 radiologists by ~10%. RADAR offers a scalable, versatile, and interpretable solution for abdominal CT, demonstrating that generalist AI can match human experts in general and complicated radiology tasks.