A New Framework for Interleaved Scanning in Cardiovascular MR: Application to Image-Based Respiratory Motion Correction in Coronary MR Angiography
A New Framework for Interleaved Scanning in Cardiovascular MR: Application to Image-Based Respiratory Motion Correction in Coronary MR Angiography
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DOI：
10.1002/mrm.25149
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发表时间：
2015-02-01
影响因子：
3.3
通讯作者：
Botnar, Rene M.
中科院分区：
文献类型：
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作者：
Henningsson, Markus;Mens, Giel;Botnar, Rene M.
目的描述交错扫描的新框架，并证明其在全心冠脉 MR 血管造影 (CMRA) 中基于图像的呼吸运动校正的有用性。方法使用所提出的方法进行扫描交错是通过在执行过程中的任意时间点在单独定义的独立扫描之间切换来实现的，使用通用函数调用。扫描交错框架用于执行扫描交错，以实现基于图像的 CMRA 呼吸导航，具有螺旋、径向和笛卡尔回波平面成像 (EPI) 导航器 k 空间轨迹。对八名健康志愿者进行了扫描。结果与径向导航器相比，使用螺旋和笛卡尔 EPI 导航器获得了改善的冠状血管清晰度和视觉评分。结论证明了所提出的扫描交错框架对于基于图像的呼吸运动校正的有用性。它有助于将图像导航器采集数据与不同的 k 空间轨迹进行更直接的比较。此外，我们可以证明螺旋和笛卡尔 EPI 导航器可能特别适合基于图像的运动校正，因为它们提供改进的运动校正和高导航器表观信噪比，同时花费很少的磁化，从而最大限度地减少饱和效应。 Magn Reson Med 73:692-696, 2015。(c) 2014 Wiley periodicals, Inc.
PurposeTo describe a new framework for interleaving scans and demonstrate its usefulness for image-based respiratory motion correction in whole heart coronary MR angiography (CMRA).MethodsScan interleaving using the proposed approach was achieved by switching between separately defined, independent scans at arbitrary time points during their execution, using a generic function call. The scan interleaving framework was used to perform scan interleaving for image-based respiratory navigation of CMRA with spiral, radial, and Cartesian echo-planar imaging (EPI) navigator k-space trajectories. Eight healthy volunteers were scanned.ResultsImproved coronary vessel sharpness and visual scores were obtained using spiral and Cartesian EPI navigators compared with radial navigators.ConclusionThe usefulness of the proposed scan interleaving framework was demonstrated for image-based respiratory motion correction. It facilitated more direct comparisons of image navigator acquisitions with different k-space trajectories. Furthermore, we could demonstrate that spiral and Cartesian EPI navigators may be particularly suitable for image-based motion correction, as they provide improved motion correction and high navigator apparent signal-to-noise ratio while spending very little magnetization, thereby minimizing saturation effects. Magn Reson Med 73:692-696, 2015. (c) 2014 Wiley Periodicals, Inc.