采用SENSE/GRAPPA组合的加速容积磁共振成像
Accelerated volumetric MRI with a SENSE/GRAPPA combination.
作者信息
Blaimer Martin, Breuer Felix A, Seiberlich Nicole, Mueller Matthias F, Heidemann Robin M, Jellus Vladimir, Wiggins Graham, Wald Lawrence L, Griswold Mark A, Jakob Peter M
机构信息
Department of Experimental Physics 5, University of Würzburg, Würzburg, Germany.
出版信息
J Magn Reson Imaging. 2006 Aug;24(2):444-50. doi: 10.1002/jmri.20632.
PURPOSE
To combine the specific advantages of the generalized autocalibrating partially parallel acquisitions (GRAPPA) technique and sensitivity encoding (SENSE) with two-dimensional (2D) undersampling.
MATERIALS AND METHODS
By splitting the 2D reconstruction process into multiple one-dimensional (1D) reconstructions, the normal 1D GRAPPA method can be used for image reconstruction. Due to this data-handling process, a GRAPPA reconstruction is performed along the phase-encoding (PE) direction and effectively a SENSE reconstruction is performed along the partition-encoding (PAE) direction.
RESULTS
In vivo experiments demonstrate the successful implementation of the SENSE/GRAPPA combination. Experimental results with up to 9.6-fold acceleration using a prototype 32-channel receiver head coil array are presented.
CONCLUSION
The proposed SENSE/GRAPPA combination for 3D imaging allows the GRAPPA method to be applied in combination with 2D undersampling. Because the SENSE/GRAPPA combination is not based on knowledge of spatial coil sensitivities, it should be the method of choice whenever it is difficult to extract the sensitivity information.
目的
将广义自校准部分并行采集（GRAPPA）技术和灵敏度编码（SENSE）的特定优势与二维（2D）欠采样相结合。
材料与方法
通过将二维重建过程拆分为多个一维（1D）重建，可使用常规的一维GRAPPA方法进行图像重建。由于这种数据处理过程，GRAPPA重建沿相位编码（PE）方向进行，而实际上SENSE重建沿分区编码（PAE）方向进行。
结果
体内实验证明了SENSE/GRAPPA组合的成功实施。展示了使用原型32通道接收头线圈阵列实现高达9.6倍加速的实验结果。
结论
所提出的用于三维成像的SENSE/GRAPPA组合允许GRAPPA方法与二维欠采样结合应用。由于SENSE/GRAPPA组合不基于空间线圈灵敏度知识，因此在难以提取灵敏度信息时，它应是首选方法。
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