A Parallel Imaging Technique Using Mutual Calibration for Split-Blade Diffusion-Weighted PROPELLER
A Parallel Imaging Technique Using Mutual Calibration for Split-Blade Diffusion-Weighted PROPELLER
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DOI：
10.1002/mrm.22646
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发表时间：
2011-03-01
影响因子：
3.3
通讯作者：
Huo, Donglai
中科院分区：
文献类型：
--
作者：
Li, Zhiqiang;Pipe, James G.;Huo, Donglai
针对扩散加权回波平面成像中存在的几何畸变和高分辨率成像困难等问题，提出了劈裂叶片扩散加权周期性旋转重叠平行线增强重建方法（DW-PROPELLER）。DW-PROPELLER的主要缺点是它的高SAR（特别是在3T时）和违反Carr-Purcell-Meiboom-Gill条件，导致扫描时间长和叶片窄。平行成像可以减少扫描时间，增加叶片宽度；然而，由于叶片狭窄，将标准的基于k空间的技术（如广义自校准部分平行采集（GRAPPA））应用于劈裂叶片DW-PROPELLER非常具有挑战性。本文提出了一种新的基于k空间的平行成像方法的校准方案，该方案无需额外的校准数据，从而获得更宽、更稳定的叶片。体内实验结果表明，该技术具有广阔的应用前景。中国医学杂志，2011,25(3):638-644。(c) 2010 Wiley-Liss, Inc。
Split-blade diffusion-weighted periodically rotated overlapping parallel lines with enhanced reconstruction (DW-PROPELLER) was proposed to address the issues associated with diffusion-weighted echo planar imaging such as geometric distortion and difficulty in high-resolution imaging. The major drawbacks with DW-PROPELLER are its high SAR (especially at 3T) and violation of the Carr-Purcell-Meiboom-Gill condition, which leads to a long scan time and narrow blade. Parallel imaging can reduce scan time and increase blade width; however, it is very challenging to apply standard k-space-based techniques such as GeneRalized Autocalibrating Partially Parallel Acquisitions (GRAPPA) to split-blade DW-PROPELLER due to its narrow blade. In this work, a new calibration scheme is proposed for k-space-based parallel imaging method without the need of additional calibration data, which results in a wider, more stable blade. The in vivo results show that this technique is very promising. Magn Reson Med 65: 638-644, 2011. (c) 2010 Wiley-Liss, Inc.