Kressler Bryan, Spincemaille Pascal, Prince Martin R, Wang Yi
Department of Biomedical Engineering, Cornell University, Ithaca, New York, USA.
Magn Reson Med. 2006 Sep;56(3):704-8. doi: 10.1002/mrm.21004.
Time-resolved 3D MRI with high spatial and temporal resolution can be achieved using spiral sampling and sliding-window reconstruction. Image reconstruction is computationally intensive because of the need for data regridding, a large number of temporal phases, and multiple RF receiver coils. Inhomogeneity blurring correction for spiral sampling further increases the computational work load by an order of magnitude, hindering the clinical utility of spiral trajectories. In this work the reconstruction time is reduced by a factor of >40 compared to reconstruction using a single processor. This is achieved by using a cluster of 32 commercial off-the-shelf computers, commodity networking hardware, and readily available software. The reconstruction system is demonstrated for time-resolved spiral contrast-enhanced (CE) peripheral MR angiography (MRA), and a reduction of reconstruction time from 80 min to 1.8 min is achieved.
使用螺旋采样和滑动窗口重建技术可以实现具有高空间和时间分辨率的时间分辨三维磁共振成像（MRI）。由于需要进行数据重网格化、大量的时间相位以及多个射频接收线圈，图像重建的计算量很大。螺旋采样的不均匀性模糊校正进一步将计算工作量增加了一个数量级，这阻碍了螺旋轨迹在临床上的应用。在这项工作中，与使用单个处理器进行重建相比，重建时间减少了40倍以上。这是通过使用由32台商用现货计算机、商用网络硬件和现成软件组成的集群来实现的。该重建系统在时间分辨螺旋对比增强（CE）外周磁共振血管造影（MRA）中得到了验证，重建时间从80分钟减少到了1.8分钟。
