Whole-heart coronary MR angiography with 2D self-navigated image reconstruction
Whole-heart coronary MR angiography with 2D self-navigated image reconstruction
复制标题
DOI：
10.1002/mrm.23027
复制
发表时间：
2012-02-01
影响因子：
3.3
通讯作者：
Botnar, Rene M.
中科院分区：
文献类型：
--
作者：
Henningsson, Markus;Koken, Peter;Botnar, Rene M.
已经提出了几种自导航技术来改善冠状动脉MR血管造影中的呼吸运动补偿。在这项工作中，我们实现了一个二维自导航方法，通过使用启动配置文件的全心脏平衡的稳态自由进动序列，这主要是用来催化磁化向稳态。为了创建2D自导航图像（2DSN），我们在启动配置文件中添加了相位编码梯度。通过这种方法，我们计算了脚部和左侧运动，并进行了回顾性平移运动校正。2DSN图像是从每次拍摄开始时采集的10个启动配置文件重建的。对9名健康受试者进行了扫描，并将所提出的方法与仅具有页脚校正的1D自导航（1DSN）方法进行了比较。还使用0.6的跟踪因子，使用光学1D笔形波束导航器（1Dnav）进行了脚部校正。对于所有冠状动脉和所有受试者，对于10 mm的研究的血管门控窗口，2DSN显示出与1DSN和1Dnav相比改善的运动校正。与2DSN方法相比，使用多靶点2D自导航方法可以显著改善右冠状动脉的可视化血管长度。Magn Reson Med，2012年。(C)2011 Wiley Periodicals，Inc.
Several self-navigation techniques have been proposed to improve respiratory motion compensation in coronary MR angiography. In this work, we implemented a 2D self-navigation method by using the startup profiles of a whole-heart balanced Steady-state free precession sequence, which are primarily used to catalyze the magnetization towards the steady-state. To create 2D self-navigation images (2DSN), we added phase encoding gradients to the startup profiles. With this approach we calculated foothead and leftright motion and performed retrospective translational motion correction. The 2DSN images were reconstructed from 10 startup profiles acquired at the beginning of each shot. Nine healthy subjects were scanned, and the proposed method was compared to a 1D self-navigation (1DSN) method with foothead correction only. Foothead correction was also performed with the diaphragmatic 1D pencil beam navigator (1Dnav) using a tracking factor of 0.6. 2DSN shows improved motion correction compared to 1DSN and 1Dnav for all coronary arteries and all subjects for the investigated diaphragmatic gating window of 10 mm. The visualized vessel length of the right coronary artery could be significantly improved with a multiple targeted 2D self-navigation approach, compared to 2DSN method. Magn Reson Med, 2012. (C) 2011 Wiley Periodicals, Inc.