Hongxin Chu1, Jianming Li2. 1. Department of Nuclear Medicine, TEDA International Cardiovascular Hospital and Tianjin Medical University Cardiovascular Clinical Institute, Tianjin, 300457, China. 2. Department of Nuclear Medicine, TEDA International Cardiovascular Hospital and Tianjin Medical University Cardiovascular Clinical Institute, Tianjin, 300457, China. ichlijm@163.com.