3-DIMENSIONAL SPECTROSCOPIC IMAGING WITH TIME-VARYING GRADIENTS
3-DIMENSIONAL SPECTROSCOPIC IMAGING WITH TIME-VARYING GRADIENTS
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DOI：
10.1002/mrm.1910330402
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发表时间：
1995-04-01
影响因子：
3.3
通讯作者：
MACOVSKI, A
中科院分区：
文献类型：
--
作者：
ADALSTEINSSON, E;IRARRAZABAL, P;MACOVSKI, A
在切片选择方向上具有时变读出梯度的光谱成像序列被用于对多个连续切片进行成像。对于给定的体素大小，三维光谱序列的成像时间和信噪比与没有振荡读出梯度的单个切片采集相同。数据重建采用二维网格算法将非均匀采样的数据插值到笛卡尔网格上，并采用四维快速傅立叶变换：三维空间和光谱维。该方法通过在1.5T下在人脑中NAA的体内成像来证明，其中在17分钟的总扫描时间内获得10个切片的16 × 16像素光谱图像。
A spectroscopic imaging sequence with a time-varying readout gradient in the slice selection direction is used to image multiple contiguous slices. For a given voxel size, the imaging time and signal-to-noise ratio of the three-dimensional spectroscopic sequence are the same as for a single slice acquisition without the oscillating readout gradient. The data reconstruction employs a gridding algorithm in two dimensions to interpolate the nonuniformly sampled data onto a Cartesian grid, and a fast Fourier transform in four dimensions: three spatial dimensions and the spectral dimension. The method is demonstrated by in vivo imaging of NAA in human brain at 1.5 T with 10 slices of 16 x 16 pixels spectroscopic images acquired in a total scan time of 17 min.