Fast parallel spiral chemical shift imaging at 3T using iterative SENSE reconstruction
Fast parallel spiral chemical shift imaging at 3T using iterative SENSE reconstruction
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DOI：
10.1002/mrm.21572
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发表时间：
2008-04-01
影响因子：
3.3
通讯作者：
Bammer, Roland
中科院分区：
文献类型：
--
作者：
Mayer, Dirk;Kim, Dong-Hyun;Bammer, Roland
螺旋化学位移成像（CSI）是一种同时编码一维光谱和二维空间信息的快速CSI技术。因此，它有可能允许一个人在一个镜头中执行2D-CSI实验。然而，对于大多数应用来说，最大梯度强度和摆幅率的限制使得需要多次激发才能获得所需的频谱带宽。在这项工作中，我们通过使用迭代灵敏度编码重建算法减少了空间交错的数量，从而减少了螺旋CSI的最小总测量时间，该算法利用了单个接收器线圈的空间非均匀灵敏度曲线提供的互补空间编码。实验结果表明，该方法具有良好的视觉效果。平行螺旋CSI生成的脑代谢物图与使用全采样数据的传统网格重建获得的图相似，只有时间归一化信噪比的小幅下降，以及更高加速因子时噪声的小幅增加。
Spiral chemical shift imaging (CSI) is a fast CSI technique that simultaneously encodes 1D spectral and 2D spatial information. Therefore, it potentially allows one to perform a 2D-CSI experiment in a single shot. However, for most applications, limitations on maximum gradient strength and slew rate make multiple excitations necessary in order to achieve a desired spectral bandwidth. In this work we reduce the number of spatial interleaves and, hence, the minimum total measurement time of spiral CSI by using an iterative sensitivity encoding reconstruction algorithm which utilizes complementary spatial encoding afforded by the spatially inhomogeneous sensitivity profiles of individual receiver coils. The performance of the new method was evaluated in phantom and in vivo experiments. Parallel spiral CSI produced maps of brain metabolites similar to those obtained using conventional gridding reconstruction of the fully sampled data with only a small decrease in time-normalized signal-to-noise ratio and a small increase in noise for higher acceleration factors.