Simultaneous acquisition of spatial harmonics (SMASH): Fast imaging with radiofrequency coil arrays
Simultaneous acquisition of spatial harmonics (SMASH): Fast imaging with radiofrequency coil arrays
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DOI：
10.1002/mrm.1910380414
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发表时间：
1997-10-01
影响因子：
3.3
通讯作者：
Manning, WJ
中科院分区：
文献类型：
--
作者：
Sodickson, DK;Manning, WJ
同时获得空间谐波（SMASH）是一种新的快速成像技术，可通过整数因素来提高MR图像采集速度，而不是现有的快速成像方法，而无需在空间分辨率或信噪比的比率上进行显着牺牲。通过利用表面线圈阵列几何形状固有的空间信息来替代通常由磁场梯度产生的一些相编码来减少图像采集时间。这允许使用许多现有快速成像序列进行部分并行图像采集。与先前提出的并行成像的数据组合算法不同，Smash重建涉及一小部分MR信号组合，然后在傅立叶变换之前，这对于人工处理和实用实现可能是有利的。在这里，使用两个不同的MR成像系统上的商业阶数阵列线圈在此证明了图像采集时间的两倍节省。对于适当的线圈设计，可以预期较大的时间节省因素。
SiMultaneous Acquisition of Spatial Harmonics (SMASH) is a new fast-imaging technique that increases MR image acquisition speed by an integer factor over existing fast-imaging methods, without significant sacrifices in spatial resolution or signal-to-noise ratio. Image acquisition time is reduced by exploiting spatial information inherent in the geometry of a surface coil array to substitute for some of the phase encoding usually produced by magnetic field gradients. This allows for partially parallel image acquisitions using many of the existing fast-imaging sequences. Unlike the data combination algorithms of prior proposals for parallel imaging, SMASH reconstruction involves a small set of MR signal combinations prior to Fourier transformation, which can be advantageous for artifact handling and practical implementation. A twofold savings in image acquisition time is demonstrated here using commercial phased array coils on two different MR-imaging systems. Larger time savings factors can be expected for appropriate coil designs.