Madio D P, Lowe I J
Department of Physics and Astronomy, University of Pittsburgh, Carnegie Mellon University, Pennsylvania, USA.
Magn Reson Med. 1995 Oct;34(4):525-9. doi: 10.1002/mrm.1910340407.
A new ultra-fast imaging technique that does not place extreme demands on the speed of the gradient system is described. When used with comparable MRI systems, the rotating ultra-fast imaging sequence (RUFIS) can acquire images 4 to 5 times faster than gradient-moment nulled EPI and more than twice as fast as DUFIS, OUFIS, or BURST techniques. Because the technique uses free induction decays instead of echoes, it can be made particularly insensitive to effects of motion, flow, and diffusion. Preliminary images of turbulent flow are presented to demonstrate this insensitivity. However, with appropriate encoding, flow effects may be imaged.
本文描述了一种新型超快速成像技术，该技术对梯度系统的速度没有极高要求。当与类似的磁共振成像（MRI）系统配合使用时，旋转超快速成像序列（RUFIS）获取图像的速度可比梯度矩归零回波平面成像（EPI）快4至5倍，比双极梯度回波超快速成像序列（DUFIS）、优化超快速成像序列（OUFIS）或快速扰相稳态采集序列（BURST）快两倍以上。由于该技术使用自由感应衰减而非回波，所以它对运动、流动和扩散的影响特别不敏感。文中展示了湍流的初步图像以证明这种不敏感性。然而，通过适当的编码，也可以对流动效应进行成像。
