McKinnon G C
Radiology Department, University Hospital, Zurich, Switzerland.
Magn Reson Med. 1993 Nov;30(5):609-16. doi: 10.1002/mrm.1910300512.
Ultra-fast imaging traditionally implies either echo-planar imaging on specially developed gradient systems, or very short repetition time gradient-echo imaging on standard magnetic resonance imaging scanners. An alternative strategy for very fast imaging with conventional whole-body scanners is discussed here. The technique is a hybrid, whereby the advantages of gradient-echo imaging and echo-planar imaging are combined. It is here denoted interleaved gradient-echo-planar imaging. It is not a single specific measurement sequence, but rather a continuum of sequences whereby multiple excitations with multiple gradient-echos are employed. The power of this fast imaging approach is that one has much more flexibility toward the optimization of the measurement sequence with respect to imaging time, T2 relaxation, gradient power, resolution, image distortion, and signal-to-noise ratio. In vivo human heart images, acquired in 110 ms, and with a resolution of 2.5 mm, have been obtained with a standard whole-body scanner.
传统上，超快速成像意味着在专门开发的梯度系统上进行回波平面成像，或者在标准磁共振成像扫描仪上进行非常短重复时间的梯度回波成像。本文讨论了一种使用传统全身扫描仪进行超快速成像的替代策略。该技术是一种混合技术，它结合了梯度回波成像和回波平面成像的优点。在此将其称为交错梯度回波平面成像。它不是一个单一的特定测量序列，而是一系列序列，其中采用了多个具有多个梯度回波的激发。这种快速成像方法的优势在于，在成像时间、T2弛豫、梯度功率、分辨率、图像失真和信噪比方面，人们在优化测量序列时有更大的灵活性。使用标准全身扫描仪已获得了体内人体心脏图像，采集时间为110毫秒，分辨率为2.5毫米。
