Use of pattern recognition for unaliasing simultaneously acquired slices in simultaneous multislice MR fingerprinting.
Use of pattern recognition for unaliasing simultaneously acquired slices in simultaneous multislice MR fingerprinting.
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DOI：
10.1002/mrm.26572
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发表时间：
2017-11
影响因子：
3.3
通讯作者：
Griswold MA
中科院分区：
文献类型：
--
作者：
Jiang Y;Ma D;Bhat H;Ye H;Cauley SF;Wald LL;Setsompop K;Griswold MA
本研究的目的是通过使用同步多切片方法来加速磁共振指纹采集。设计了一种多频带射频（RF）脉冲，以激发具有不同翻转角和相位的两个切片。两个切片的信号被驱动为尽可能正交。将混合和欠采样的MRF信号与两个字典进行匹配，以检索每个切片的T1和T2图。从所提出的方法的定量结果进行了验证与金标准自旋回波方法在一个幻影。T1和T2地图在体内人脑从两个同时获得的切片进行了比较，MRF-FISP与单波段RF激励的结果。体模结果表明，与金标准自旋回波方法相比，SMS MRF-FISP方法准确地量化了弛豫特性。T1和T2值在体内脑从所提出的方法也匹配的结果，从正常的MRF-FISP采集。即使在单通道接收线圈中，也可以使用我们提出的采集在多频带加速因子2下量化T1和T2值。通过将该方法与并行成像或迭代重建相结合，可以实现进一步的加速。
The purpose of this study is to accelerate a Magnetic Resonance Fingerprinting acquisition by using a simultaneous multi-slice method. A multiband radiofrequency (RF) pulse was designed to excite two slices with different flip angles and phases. The signals of two slices were driven to be as orthogonal as possible. The mixed and undersampled MRF signal was matched to two dictionaries to retrieve T1 and T2 maps of each slice. Quantitative results from the proposed method were validated with the gold standard spin echo methods in a phantom. T1 and T2 maps of in vivo human brain from two simultaneously acquired slices were also compared to the results of MRF-FISP with a single-band RF excitation. The phantom results showed that the SMS MRF-FISP method quantified the relaxation properties accurately compared to the gold standard spin echo methods. T1 and T2 values of in vivo brain from the proposed method also matched the results from the normal MRF-FISP acquisition. T1 and T2 values can be quantified at a multiband acceleration factor of two using our proposed acquisition even in a single channel receive coil. Further acceleration could be achieved by combining this method with parallel imaging or iterative reconstruction.