Feinberg D A, Turner R, Jakab P D, von Kienlin M
Harvard Medical School, Department of Radiology, Brigham and Women's Hospital, Boston, Massachusetts 02115.
Magn Reson Med. 1990 Jan;13(1):162-9. doi: 10.1002/mrm.1910130116.
Single-shot echo-planar imaging is notoriously vulnerable to image artifacts, arising from the necessity of alternate echo time reversal during image reconstruction and from static field inhomogeneity. A technique for overcoming these problems, which further permits imaging on systems with relatively poor gradient waveforms, when data are collected always with the same gradient polarity, is presented. Subsectional and 3D volume imaging are presented as well as a novel phase-correction method for Hermitian symmetry in "half-Fourier" echo-planar imaging.
单次激发回波平面成像因图像伪影问题而声名狼藉，这些伪影源于图像重建过程中交替回波时间反转的必要性以及静磁场不均匀性。本文提出了一种克服这些问题的技术，该技术在始终以相同梯度极性采集数据时，还允许在具有相对较差梯度波形的系统上进行成像。文中展示了分段成像和三维容积成像，以及一种用于“半傅里叶”回波平面成像中厄米对称性的新型相位校正方法。
