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目的:评价呼吸导航回波触发的冠状动脉MRA的效率以及心律和心率对图像质量的影响。材料和方法:17例健康志愿者,用导航回波触发3DSSFP序列进行冠状动脉成像,用自动窗位选择相位排列技术(PAWS)导航回波使膈肌触发采样窗宽为3mm,测量冠状动脉的长度,分析图像质量和心率、心律及呼吸的关系。结果:各冠状动脉主支的长度分别为:右冠状动脉11.6±2.0cm,左主干2.4±0.4cm,左前降支9.0±1.2cm,左回旋支5.0±0.8cm;PAWS的触发效率为37.7%,单次采样耗时6.6±1.0min;图像质量与呼吸方式无关,随着心率增快和心律不规则而降低。结论:PAWS导航回波触发的3DSSFP序列可以很好地控制冠状动脉MRA时的呼吸运动,但是需要提高成像效率以控制心脏运动。
PURPOSE: To evaluate the efficiency of MRA triggered by respiratory navigator echo and the effect of heart rate and heart rate on image quality. MATERIALS AND METHODS: Seventeen healthy volunteers were enrolled in this study. The 3DSSFP sequence was acquired by navigational echo and coronary angiography was performed. The echo amplitude was estimated by using automatic window-select phase array (PAWS). The width of the coronary artery , Analyze the relationship between image quality and heart rate, heart rate and respiration. Results: The lengths of the main branches of the coronary arteries were 11.6 ± 2.0 cm in the right coronary artery, 2.4 ± 0.4 cm in the left main trunk, 9.0 ± 1.2 cm in the left anterior descending artery and 5.0 ± 0.8 cm in the left circumflex artery. The triggering efficiency of PAWS was 37.7% , A single sampling took 6.6 ± 1.0min; image quality and breathing mode has nothing to do with the heart rate and irregular heart rate and reduce. Conclusion: The 3DSSFP sequence triggered by PAWS navigator echo can control the respiration of MRA coronary arteries well, but it is necessary to improve the imaging efficiency to control cardiac motion.