Zaitsev M, Zilles K, Shah N J
Institut für Medizin, Forschungszentrum Jülich GmbH, Jülich, Germany.
Magn Reson Med. 2001 Jan;45(1):109-17. doi: 10.1002/1522-2594(200101)45:1<109::aid-mrm1015>3.0.co;2-x.
Time-dependent phenomena are of great interest, and researchers have sought to shed light on these processes with MRI, particularly in vivo. In this work, a new hybrid technique based on EPI and using the concept of keyhole imaging is presented. By sharing peripheral k-space data between images and acquiring the keyhole more frequently, it is shown that the spatial resolution of the reconstructed images can be maintained. The method affords a higher temporal resolution and is more robust against susceptibility and chemical-shift artifacts than single-shot EPI. The method, termed shared k-space echo planar imaging with keyhole (shared EPIK), has been implemented on a standard clinical scanner. Technical details, simulation results, phantom images, in vivo images, and fMRI results are presented. These results indicate that the new method is robust and may be used for dynamic MRI applications. Magn Reson Med 45:109-117, 2001.
随时间变化的现象备受关注，研究人员一直试图利用磁共振成像（MRI），尤其是在活体中，来深入了解这些过程。在这项工作中，提出了一种基于回波平面成像（EPI）并采用钥匙孔成像概念的新型混合技术。通过在图像之间共享外周k空间数据并更频繁地采集钥匙孔数据，结果表明重建图像的空间分辨率得以保持。该方法具有更高的时间分辨率，并且比单次激发EPI对敏感性和化学位移伪影更具鲁棒性。这种被称为带钥匙孔的共享k空间回波平面成像（shared EPIK）的方法已在标准临床扫描仪上实现。文中给出了技术细节、模拟结果、体模图像、活体图像以及功能磁共振成像（fMRI）结果。这些结果表明该新方法具有鲁棒性，可用于动态MRI应用。《磁共振医学》45:109 - 117, 2001年。
