Time-resolved 3D MR velocity mapping at 3T: Improved navigator-gated assessment of vascular anatomy and blood flow
Time-resolved 3D MR velocity mapping at 3T: Improved navigator-gated assessment of vascular anatomy and blood flow
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DOI：
10.1002/jmri.20871
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发表时间：
2007-04-01
影响因子：
4.4
通讯作者：
Frydrychowicz, Alex
中科院分区：
文献类型：
--
作者：
Markl, Michael;Harloff, Andreas;Frydrychowicz, Alex
目的：评价一种改进的图像采集和数据处理策略，用于评估主动脉血管几何形状和3 T下的3D血流。材料和方法：在一项包含5名正常志愿者和7名已知主动脉病变患者的研究中，前瞻性ECG门控电影三维（3D）MR速度标测（采用改进的导航器门控），进行实时自适应k空间排序和导航器接受标准的动态调整。除了形态学信息和三个方向的血流速度，相位对比（PC）-MRA图像来自相同的数据集，它允许血管边界的三维等值面绘制与血流模式的可视化相结合。
Purpose: To evaluate an improved image acquisition and data-processing strategy for assessing aortic vascular geometry and 3D blood flow at 3T.Materials and Methods: In a study with five normal volunteers and seven patients with known aortic pathology, prospectively ECG-gated cine three-dimensional (3D) MR velocity mapping with improved navigator gating, real-time adaptive k-space ordering and dynamic adjustment of the navigator acceptance criteria was performed. In addition to morphological information and three-directional blood flow velocities, phase-contrast (PC)-MRA images were derived from the same data set, which permitted 3D isosurface rendering of vascular boundaries in combination with visualization of blood-flow patterns.Results: Analysis of navigator performance and image quality revealed improved scan efficiencies of 63.6% +/- 10.5% and temporal resolution (