Multidimensionally encoded magnetic resonance imaging
Multidimensionally encoded magnetic resonance imaging
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DOI：
10.1002/mrm.24443
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发表时间：
2013-07-01
影响因子：
3.3
通讯作者：
Lin, Fa-Hsuan
中科院分区：
文献类型：
--
作者：
Lin, Fa-Hsuan
磁共振成像（MRI）通常通过测量q维对象在由线性空间编码磁场（SEM）创建的q维空间基础上的投影来实现空间编码。最近，使用非线性SEM的成像策略已经证明了具有更高时空分辨率和减少外周神经刺激的重建图像的潜在优势。在实践中，非线性SEM和线性SEM可以联合使用，以进一步提高图像重建性能。在这里，我们提出了多维编码（MDE）MRI映射到p维编码空间，其中p > q的q维对象。MDE MRI是使用线性和非线性SEM连接成像策略的理论框架。使用8个表面SEM线圈与8通道射频线圈阵列的系统，我们展示了二维物体的五维MDE MRI，作为PatLoc成像和O空间成像的进一步推广。我们还提出了一种优化MDE MRI空间基础的方法。结果表明，在控制k空间采样分布和采样数的情况下，采用高维编码空间的MDE MRI可以更有效地重建图像，且重建误差较小。Magn Reson Med，2013年。(c)2012 Wiley Periodicals，Inc.
Magnetic resonance imaging (MRI) typically achieves spatial encoding by measuring the projection of a q-dimensional object over q-dimensional spatial bases created by linear spatial encoding magnetic fields (SEMs). Recently, imaging strategies using nonlinear SEMs have demonstrated potential advantages for reconstructing images with higher spatiotemporal resolution and reducing peripheral nerve stimulation. In practice, nonlinear SEMs and linear SEMs can be used jointly to further improve the image reconstruction performance. Here, we propose the multidimensionally encoded (MDE) MRI to map a q-dimensional object onto a p-dimensional encoding space where p > q. MDE MRI is a theoretical framework linking imaging strategies using linear and nonlinear SEMs. Using a system of eight surface SEM coils with an eight-channel radiofrequency coil array, we demonstrate the five-dimensional MDE MRI for a two-dimensional object as a further generalization of PatLoc imaging and O-space imaging. We also present a method of optimizing spatial bases in MDE MRI. Results show that MDE MRI with a higher dimensional encoding space can reconstruct images more efficiently and with a smaller reconstruction error when the k-space sampling distribution and the number of samples are controlled. Magn Reson Med, 2013. (c) 2012 Wiley Periodicals, Inc.