Mingli Sun1, Runduo Pan2, Xianglei Kong2, Dianbo Cao3. 1. Department of Intensive Care Unit, The First Hospital of Ji Lin University, Chang Chun, China. 2. Department of Radiology, The First Hospital of Ji Lin University, Chang Chun, China. 3. Department of Radiology, The First Hospital of Ji Lin University, Chang Chun, China. Electronic address: caotianbo@126.com.