磁共振自由呼吸冠状动脉血管成像技术的初步探讨

Preliminary Study of MR Coronary Angiography under Free Breathing in the Assessment of Coronary Artery

目的探讨自由呼吸状态下运用超快速平衡式梯度回波序列(sBTFE/3D/NAVI)进行磁共振冠状动脉血管成像技术的可靠性。方法20例健康志愿者运用sBTFE/3D/NAVI,结合呼吸导航技术,自由呼吸状态下对左右冠状动脉分别扫描,经MIP后处理获得冠状动脉图像。观察冠状动脉的显示率,测量各冠状动脉的显示长度及心肌,冠脉的信号强度及信噪比。结果20例受检者均完成检查,右冠状动脉、左冠状动脉主干、前降支全部显示;左冠状动脉回旋支显示良好18例(90%)。冠状动脉图像的信噪比为37.35±6.32,心肌组织的信噪比为20.03±7.25,两者比较有显著性差异(P<0.01)。结论自由呼吸sBTFE/3D/NAVI冠脉成像方法显示成功率高,图像信噪比好,可作为不能屏气患者心脏冠脉检查的一种无创性手段。

Objective：To evaluate the value of sBTFE/3D/NAVI sequence for MR coronary angiography under free breathing. Methods： Free breathing real time navigator three-dimensional MR coronary angiography （sBTFE/3D/NAVI） was performed in twenty healthy volunteers for right and left coronary artery （CA） respectively. The images of major CA were acquired after post-processing with maximum intensity projection （MIP） technique. The rate of detection, length, signal intensities as well as the signal-noise ratio （SNR） of CA and myocardium were evaluated. Results： Free breathing real time navigator three-dimensional MR coronary angiography was successfully performed in all cases. The rate of displaying right CA,main trunk and anterior descending branches of left CA were 100 % ,of left circumflex branch were 90% （18 cases） respectively. The SNR of CA was 37.35 ± 6.32 ; of myocardial tissue was 20. 23 ± 7. 25 respectively, with significant statistical differences （P〈0.01）. Conclusion： Free breathing real time navigator three-dimensional MR coronary angiography is a non-invasive technique with high success rate and SNR, which is very helpful for patients impossible for breathholding.