自触发心脏磁共振成像

Self-gated cardiac magnetic resonance imaging

目的探讨和实现一种自触发磁共振心脏成像(CMRI)。方法将心电图(ECG)信号和呼吸信号从监测信号中提取出来,然后将K空间数据重新排列、重建,得到心脏图像。结果自触发CMRI克服了传统的导联法难以获得稳定ECG信号的缺点,可提高扫描效率,得到高品质的亮血和黑血小鼠心脏电影图像。结论采用自触发CMRI可以实现小鼠心脏电影成像以及黑血成像,并用于评价其心脏结构和功能。

Objective To discuss and realize a type of self-gated cardiac magnetic resonance imaging（CMRI）.Methods K space data were rearranged according to electrocardiogram（ECG） and respiration signals,and the cardiac images were reconstructed.Results ECG and respiration signals were extracted from the Navigator,which overcame the difficulty to get stable ECG signal using conventional lead.The method improved CMRI scanning efficiency.High quality bright-blood and black-blood mouse cardiac cine images were acquired.Conclusion Self-gated CMRI can realize cine CMRI and black-blood CMRI,which can be used to evaluate the structure and function of the heart in mice.