基于非刚性心脏运动校正的低秩重建技术的自由运行 3D 全心 T 和 T 映射及电影 MRI。
Free-running 3D whole-heart T and T mapping and cine MRI using low-rank reconstruction with non-rigid cardiac motion correction.
机构信息
School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK.
School of Biomedical Engineering, ShanghaiTech University, Shanghai, China.
出版信息
Magn Reson Med. 2023 Jan;89(1):217-232. doi: 10.1002/mrm.29449. Epub 2022 Oct 5.
PURPOSE
To introduce non-rigid cardiac motion correction into a novel free-running framework for the simultaneous acquisition of 3D whole-heart myocardial and maps and cine images, enabling a 3-min scan.
METHODS
Data were acquired using a free-running 3D golden-angle radial readout interleaved with inversion recovery and -preparation pulses. After correction for translational respiratory motion, non-rigid cardiac-motion-corrected reconstruction with dictionary-based low-rank compression and patch-based regularization enabled 3D whole-heart and mapping at any given cardiac phase as well as whole-heart cardiac cine imaging. The framework was validated and compared with established methods in 11 healthy subjects.
RESULTS
Good quality 3D and maps and cine images were reconstructed for all subjects. Septal values using the proposed approach ( ms) were higher than those from a 2D MOLLI sequence ( ms), which is known to underestimate , while values from the proposed approach ( ms) were in good agreement with those from a 2D GraSE sequence ( ms).
CONCLUSION
The proposed technique provides 3D and maps and cine images with isotropic spatial resolution in a single 3.3-min scan.
目的
将非刚性心脏运动校正引入一种新颖的自由运行框架中，用于同时获取 3D 全心心肌和弛豫率图以及电影图像，实现 3 分钟扫描。
方法
使用自由运行的 3D 黄金角径向读出与反转恢复和 准备脉冲交织的数据进行采集。在对平移呼吸运动进行校正后，基于字典的低秩压缩和基于补丁的正则化的非刚性心脏运动校正重建，可在任意给定的心脏相位进行 3D 全心心肌和弛豫率图以及全心心脏电影成像。该框架在 11 名健康受试者中进行了验证，并与已建立的方法进行了比较。
结果
为所有受试者重建了高质量的 3D 心肌和弛豫率图和电影图像。使用所提出的方法（ ms）的间隔值高于已知会低估 的 2D MOLLI 序列（ ms）的间隔值，而所提出的方法（ ms）的 值与 2D GraSE 序列（ ms）的 值非常吻合。
结论
该技术在单次 3.3 分钟扫描中提供了具有各向同性空间分辨率的 3D 心肌和弛豫率图以及电影图像。
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