Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277# Jiefang Ave, Wuhan, 430022, China. Hubei Province Key Laboratory of Molecular Imaging, 1277# Jiefang Ave, Wuhan, 430022, China. Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277# Jiefang Ave, Wuhan, 430022, China. liym@hust.edu.cn. Hubei Province Key Laboratory of Molecular Imaging, 1277# Jiefang Ave, Wuhan, 430022, China. liym@hust.edu.cn. Department of Emergency Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277# Jiefang Ave, Wuhan, 430022, China. zhangjinxiang@hust.edu.cn. Department of Ultrasound, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277# Jiefang Ave, Wuhan, 430022, China. xiemx@hust.edu.cn. Hubei Province Key Laboratory of Molecular Imaging, 1277# Jiefang Ave, Wuhan, 430022, China. xiemx@hust.edu.cn.