China science, technology news summary -- July 14 Xinhua 14 Jul 2021, 13:55 GMT+10 BEIJING, July 14 (Xinhua) -- The following is a summary of published science and technology news of China. AI IN MEDICAL IMAGING An artificial intelligence (AI) system that has been recently adopted by Beijing Tiantan Hospital can extend the therapeutic time window for patients suffering from cerebral ischemic stroke. The AI system, iStroke, has been developed by BioMind, an AI company providing machine intelligence solutions in medical imaging. The system can greatly cut the time of diagnostic imaging and shorten the preoperative decision-making time by providing rapid and accurate automatic imaging analysis. Therefore, the therapeutic time window for cerebral ischemic stroke can be extended from six hours to 24 hours, said Miao Zhongrong, director of the hospital's interventional neuroradiology center.