中国物理B ›› 2016, Vol. 25 ›› Issue (12): 128703-128703.doi: 10.1088/1674-1056/25/12/128703
• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇 下一篇
Accuracy and effectiveness of self-gating signals in free-breathing three-dimensional cardiac cine magnetic resonance imaging
Shuo Li(李硕), Lei Wang(王磊), Yan-Chun Zhu(朱艳春), Jie Yang(杨洁), Yao-Qin Xie(谢耀钦), Nan Fu(付楠), Yi Wang(王乙), Song Gao(高嵩)
- 1. Medical Imaging Physics Laboratory, Health Science Center, Peking University, Beijing 100191, China;
2. Department of Orthopedic Surgery, People's Hospital of Luohu, Shenzhen University, Shenzhen 518001, China;
3. Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China;
4. Department of Radiology, Weill Cornell Medical College, Cornell University, New York, NY 10021, USA
Accuracy and effectiveness of self-gating signals in free-breathing three-dimensional cardiac cine magnetic resonance imaging
Shuo Li(李硕)1,3, Lei Wang(王磊)2, Yan-Chun Zhu(朱艳春)3,4, Jie Yang(杨洁)3, Yao-Qin Xie(谢耀钦)3, Nan Fu(付楠)3, Yi Wang(王乙)4, Song Gao(高嵩)1
- 1. Medical Imaging Physics Laboratory, Health Science Center, Peking University, Beijing 100191, China;
2. Department of Orthopedic Surgery, People's Hospital of Luohu, Shenzhen University, Shenzhen 518001, China;
3. Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China;
4. Department of Radiology, Weill Cornell Medical College, Cornell University, New York, NY 10021, USA
摘要：
Conventional multiple breath-hold two-dimensional (2D) balanced steady-state free precession (SSFP) presents many difficulties in cardiac cine magnetic resonance imaging (MRI). Recently, a self-gated free-breathing three-dimensional (3D) SSFP technique has been proposed as an alternative in many studies. However, the accuracy and effectiveness of self-gating signals have been barely studied before. Since self-gating signals are crucially important in image reconstruction, a systematic study of self-gating signals and comparison with external monitored signals are needed.
Previously developed self-gated free-breathing 3D SSFP techniques are used on twenty-eight healthy volunteers. Both electrocardiographic (ECG) and respiratory bellow signals are also acquired during the scan as external signals. Self-gating signal and external signal are compared by trigger and gating window. Gating window is proposed to evaluate the accuracy and effectiveness of respiratory self-gating signal. Relative deviation of the trigger and root-mean-square-deviation of the cycle duration are calculated. A two-tailed paired t-test is used to identify the difference between self-gating and external signals. A Wilcoxon signed rank test is used to identify the difference between peak and valley self-gating triggers.
The results demonstrate an excellent correlation (P=0, R>0.99) between self-gating and external triggers. Wilcoxon signed rank test shows that there is no significant difference between peak and valley self-gating triggers for both cardiac (H=0, P>0.10) and respiratory (H=0, P>0.44) motions. The difference between self-gating and externally monitored signals is not significant (two-tailed paired-sample t-test:H=0, P>0.90).
The self-gating signals could demonstrate cardiac and respiratory motion accurately and effectively as ECG and respiratory bellow. The difference between the two methods is not significant and can be explained. Furthermore, few ECG trigger errors appear in some subjects while these errors are not found in self-gating signals.
中图分类号: (Magnetic resonance imaging)
- 87.61.-c