Abstract: To shorten scanning time and increase the feasibility of experimental results, dual-window K-space weighted navigator technique (DKWN) on right coronary MR angiography at 3. 0 T was implemented. The characteristics of DKWN technique and conventional navigator technique with fixed gating window in 25 normal subjects were evaluated. Compared to the conventional navigator sequence, DKWN sequences increase the scanning efficiency by 30% ( p < 0. 05), while maintaining good image quality; further the corresponding scanning time decreases from2. 12 to 1. 64 min (p < 0. 05). The coronary artery lengths and diameters do not show statistically significant differences between the two techniques ( p > 0. 05).

Key words: MRI, 3.0 T, motion suppression, K-space, navigator

摘要： 提出了一种新的K 空间权重导航技术(DKWN) , 该技术有利于缩短磁共振冠脉成像扫描时间同时获得好的图像质量。并将该导航技术应用到 25 位健康志愿者。经过实验分析, 相比于常规固定窗导航技术而言, DKWN 可以使导航效率提高30%(p < 0. 05) , 同时平均扫描时间由2. 12 min 缩短至 1. 64 min ( p < 0. 05), 并且图像质量相当。冠脉的直径和长度没有显著差异。

关键词: MRI, 3.0T, 运动抑制, K空间, 导航