Henningsson Markus, Mens Giel, Koken Peter, Smink Jouke, Botnar Rene M
Division of Imaging Sciences & Biomedical Engineering, King's College London, London, UK; Wellcome Trust and EPSRC Medical Engineering Center, King's College London, London, UK; BHF Centre of Excellence, King's College London, London, UK; NIHR Biomedical Research Centre, King's College London, London, UK.
Magn Reson Med. 2015 Feb;73(2):692-6. doi: 10.1002/mrm.25149. Epub 2014 Mar 17.
To describe a new framework for interleaving scans and demonstrate its usefulness for image-based respiratory motion correction in whole heart coronary MR angiography (CMRA).
Scan 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.
Improved coronary vessel sharpness and visual scores were obtained using spiral and Cartesian EPI navigators compared with radial navigators.
The 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.
描述一种用于交错扫描的新框架，并证明其在全心冠状动脉磁共振血管造影（CMRA）中基于图像的呼吸运动校正中的有用性。
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，使用通用函数调用在单独定义的独立扫描之间进行切换来实现的。扫描交错框架用于对具有螺旋、径向和笛卡尔回波平面成像（EPI）导航器k空间轨迹的CMRA基于图像的呼吸导航进行扫描交错。对8名健康志愿者进行了扫描。
与径向导航器相比，使用螺旋和笛卡尔EPI导航器可提高冠状动脉血管的清晰度和视觉评分。
所提出的扫描交错框架在基于图像的呼吸运动校正中的有用性得到了证明。它便于对具有不同k空间轨迹的图像导航器采集进行更直接的比较。此外，我们可以证明螺旋和笛卡尔EPI导航器可能特别适用于基于图像的运动校正，因为它们在消耗很少的磁化量的情况下提供了改进的运动校正和高导航器表观信噪比，从而将饱和效应降至最低。
