1 Department of Radiology, Hongqi Hospital affiliated to Mudanjiang Medical University, Mudanjiang, Heilongjiang, P.R. China.
2 Key Laboratory for Biorheological Science and Technology of Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, College of Bioengineering, Chongqing University, Chongqing, P.R. China.
3 Department of Radiology, Third Military Medical University, Qiqihar, Heilongjiang, P.R. China.
4 Department of Radiology, Daping Hospital, Army Military Medical University, Chongqing, P.R. China.