Comparison of parallel MRI reconstruction methods for accelerated 3D fast spin-echo imaging.

Comparison of parallel MRI reconstruction methods for accelerated 3D fast spin-echo imaging.
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加速 3D 快速自旋回波成像的并行 MRI 重建方法的比较。

DOI:
10.1002/mrm.21679
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发表时间:
2008-09
影响因子:
3.3
通讯作者:
Kyriakos, Walid E.
Kyriakos, Walid E.
中科院分区:
医学3区
文献类型:
--
作者:
Xiao, Zhikui;Hoge, W. Scott;Mulkern, R. V.;Zhao, Lei;Hu, Guangshu;Kyriakos, Walid E.

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并行MRI(pMRI)通过用采集阵列的分量线圈中包含的空间信息部分替代梯度编码步骤来实现成像加速。pMRI中的可变密度子采样先前被证明与均匀子采样相比产生改进的二维(2D)成像,但尚未在临床实践中常规使用。为了减少3D快速自旋回波(3D-FSE)序列的采集时间,本文研究了一种用于3D成像的特定非均匀采样方案,在直线网格上沿沿着两个相位编码(PE)方向进行二次采样。我们使用两种重建方法-2D-GRAPPA-Operator和2D-SPACE RIP-并对它们进行了比较。我们表明,高质量的图像可以使用这两种技术重建。为了评估所提出的采样方法和重建方案,结果通过模拟,幻影研究,并在体内三维人体数据。我们发现,在2D-SPACE RIP重建比在2D-GRAPPA-Operator重建中可以看到更少的伪影,具有可比的重建时间。
Parallel MRI (pMRI) achieves imaging acceleration by partially substituting gradient-encoding steps with spatial information contained in the component coils of the acquisition array. Variable-density subsampling in pMRI was previously shown to yield improved two-dimensional (2D) imaging in comparison to uniform subsampling, but has yet to be used routinely in clinical practice. In an effort to reduce acquisition time for 3D fast spin-echo (3D-FSE) sequences, this work explores a specific nonuniform sampling scheme for 3D imaging, subsampling along two phase-encoding (PE) directions on a rectilinear grid. We use two reconstruction methods—2D-GRAPPA-Operator and 2D-SPACE RIP—and present a comparison between them. We show that high-quality images can be reconstructed using both techniques. To evaluate the proposed sampling method and reconstruction schemes, results via simulation, phantom study, and in vivo 3D human data are shown. We find that fewer artifacts can be seen in the 2D-SPACE RIP reconstructions than in 2D-GRAPPA-Operator reconstructions, with comparable reconstruction times.
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