Aletras A H, Abduljalil A M, Robitaille P M
Department of Radiology, Ohio State University, Columbus, USA.
Magn Reson Med. 1996 Apr;35(4):617-20. doi: 10.1002/mrm.1910350424.
In this work, preliminary results are described for a modification of the MBEST sampling scheme such that image resolution can be increased while preserving image contrast. In this new approach, a single spin-echo is used in sampling k-space. The basic idea relies on acquiring a conventional EPI image from the center of k-space and applying a pi pulse to permit the acquisition of the two outer edges of k-space. Using this new approach, it is possible to obtain an enhancement in EPI image resolution, while reducing the extent of T2* weighting. As a result, the resulting images possess reduced T2* contrast and suffer less signal loss from T2* effects such as spatial variations in susceptibility and field inhomogeneity.
在这项工作中，描述了对MBEST采样方案进行修改的初步结果，以便在保持图像对比度的同时提高图像分辨率。在这种新方法中，在k空间采样时使用单个自旋回波。其基本思想是从k空间中心获取一幅传统的EPI图像，并施加一个π脉冲以允许获取k空间的两个外边缘。使用这种新方法，可以提高EPI图像分辨率，同时减少T2加权的程度。结果，所得图像的T2对比度降低，并且受T2*效应（如磁化率的空间变化和场不均匀性）导致的信号损失也更少。
