Desynchronization of Cartesian k‐space sampling and periodic motion for improved retrospectively self‐gated 3D lung MRI using quasi‐random numbers
Desynchronization of Cartesian k‐space sampling and periodic motion for improved retrospectively self‐gated 3D lung MRI using quasi‐random numbers
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笛卡尔 kâspace 采样和周期性运动的去同步化，用于使用准随机数改进回顾性自门控 3D 肺部 MRI
DOI：
10.1002/mrm.26159
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发表时间：
2016
影响因子：
3.3
通讯作者：
中科院分区：
文献类型：
--
作者：
目的证明在自由呼吸肺MRI中，笛卡尔k空间采样和周期运动之间的去同步提高了回溯性呼吸自门的稳健性和效率。方法根据二维准随机(QR)数对三维闪光序列的相位(Ky)和分区(Kz)编码进行重新排序来实现去同步。对于回溯性呼吸自选通，在每条编码的k空间线之后分别采集k空间中心信号(DC信号)。QR采样的结果是，在选通之后，k空间的线条分布均匀。使用迭代GRAPPA重建由选通过程产生的遗漏的线。志愿者进行了测量，以比较准随机抽样和常规抽样。通过患者测量验证了QR采样在临床环境中的可行性。结果与常规采样相比，回溯性门控后均匀采样的k空间允许更稳定的迭代GRAPPA重建和改善的鬼影伪影减少。结果表明，这种稳定性既可以用于减少总扫描时间，也可以用于重建不同呼吸时相的无伪影数据集，两者都提高了回溯性呼吸自门的效率。结论QR采样导致重复数据采集和周期性呼吸运动之间的去同步。这导致在更短的扫描时间内改进的运动伪影减少。Magn Reson Med 77：787-793,2017。2016年国际核磁共振医学学会
PurposeTo demonstrate that desynchronization between Cartesian k‐space sampling and periodic motion in free‐breathing lung MRI improves the robustness and efficiency of retrospective respiratory self‐gating.MethodsDesynchronization was accomplished by reordering the phase (ky) and partition (kz) encoding of a three‐dimensional FLASH sequence according to two‐dimensional, quasi‐random (QR) numbers. For retrospective respiratory self‐gating, the k‐space center signal (DC signal) was acquired separately after each encoded k‐space line. QR sampling results in a uniform distribution of k‐space lines after gating. Missing lines resulting from the gating process were reconstructed using iterative GRAPPA. Volunteer measurements were performed to compare quasi‐random with conventional sampling. Patient measurements were performed to demonstrate the feasibility of QR sampling in a clinical setting.ResultsThe uniformly sampled k‐space after retrospective gating allows for a more stable iterative GRAPPA reconstruction and improved ghost artifact reduction compared with conventional sampling. It is shown that this stability can either be used to reduce the total scan time or to reconstruct artifact‐free data sets in different respiratory phases, both resulting in an improved efficiency of retrospective respiratory self‐gating.ConclusionQR sampling leads to desynchronization between repeated data acquisition and periodic respiratory motion. This results in an improved motion artifact reduction in shorter scan time. Magn Reson Med 77:787–793, 2017. © 2016 International Society for Magnetic Resonance in Medicine
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影响因子：
19.7
作者：
BERGIN, CJ;GLOVER, GH;PAULY, JM
通讯作者：
PAULY, JM
用于傅立叶分解 MR 肺部成像的灌注和通气滤波器。
DOI：
--
发表时间：
2015
期刊：
Zeitschrift für Medizinische Physik
影响因子：
--
作者：
Artur Wujcicki;D. Corteville;A. Materka;L. Schad
通讯作者：
L. Schad
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影响因子：
4.4
作者：
S. Weick;F. Breuer;P. Ehses;M. Völker;C. Hintze;J. Biederer;P. Jakob
通讯作者：
P. Jakob
影响因子：
3.3
作者：
Lustig, Michael;Donoho, David;Pauly, John M.
通讯作者：
Pauly, John M.
影响因子：
3.3
作者：
Crowe, ME;Larson, AC;Simonetti, OP
通讯作者：
Simonetti, OP