k-t BLAST and k-t SENSE:: Dynamic MRI with high frame rate exploiting spatiotemporal correlations
k-t BLAST and k-t SENSE:: Dynamic MRI with high frame rate exploiting spatiotemporal correlations
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DOI：
10.1002/mrm.10611
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发表时间：
2003-11-01
影响因子：
3.3
通讯作者：
Pruessmann, KP
中科院分区：
文献类型：
--
作者：
Tsao, J;Boesiger, P;Pruessmann, KP
天然物体的动态图像在K空间和时间上显示出显着的相关性。因此，仅获取减少数据并恢复缺失部分是可行的。这会导致时间分辨率改善，或者可以改善给定量的采集的空间分辨率。基于这种方法，开发了两种方法可显着提高动态成像的性能，称为K-T BLAST（广泛使用线性获取加速技术）和K-T Sense（灵敏度编码），分别与单个接收器线圈一起使用。从一小部分培训数据中学到了信号相关性，并使用所有可用信息以一致且积分的方式恢复了丢失的数据。 K-T BLAST和K-T SENSE的一般理论适用于任意K空间轨迹，时间变化的线圈敏感性以及不确定的重建问题。未经测试的示例表明，一个或六个接收器线圈的加速度（体素尺寸2.42 x 2.52 mm（2），38.4 fps）。 K-T BLAST和K-T SENSE适用于许多领域，尤其是那些表现出准碘运动的那些区域，例如心脏成像，肺，腹部和大脑在周期性刺激下。 Magn Reson Med 50：1031-1042，2003。（C）2003 Wiley-Liss，Inc。
Dynamic images of natural objects exhibit significant correlations in k-space and time. Thus, it is feasible to acquire only a reduced amount of data and recover the missing portion afterwards. This leads to an improved temporal resolution, or an improved spatial resolution for a given amount of acquisition. Based on this approach, two methods were developed to significantly improve the performance of dynamic imaging, named k-t BLAST (Broad-use Linear Acquisition Speed-up Technique) and k-t SENSE (SENSitivity Encoding) for use with a single or multiple receiver coils, respectively. Signal correlations were learned from a small set of training data and the missing data were recovered using all available information in a consistent and integral manner. The general theory of k-t BLAST and k-t SENSE is applicable to arbitrary k-space trajectories, time-varying coil sensitivities, and under- and overdetermined reconstruction problems. Examples from ungated cardiac imaging demonstrate a 4-fold acceleration (voxel size 2.42 x 2.52 mm(2), 38.4 fps) with either one or six receiver coils. k-t BLAST and k-t SENSE are applicable to many areas, especially those exhibiting quasiperiodic motion, such as imaging of the heart, the lungs, the abdomen, and the brain under periodic stimulation. Magn Reson Med 50:1031-1042, 2003. (C) 2003 Wiley-Liss, Inc.