RARE IMAGING - A FAST IMAGING METHOD FOR CLINICAL MR
RARE IMAGING - A FAST IMAGING METHOD FOR CLINICAL MR
复制标题
DOI：
10.1002/mrm.1910030602
复制
发表时间：
1986-12-01
影响因子：
3.3
通讯作者：
FRIEDBURG, H
中科院分区：
文献类型：
--
作者：
HENNIG, J;NAUERTH, A;FRIEDBURG, H
基于回波成像原理，我们提出一种方法，可在2到40秒内获取用于256×256图像的足够数据。图像对比度主要由横向弛豫时间T2决定。在一个（或几个）回波链中对二维傅里叶变换图像重建的所有投影进行采样会由于回波的不同T2加权而导致图像伪影。这些伪影不能用图像在相位方向上的简单模糊来描述。在回波上合理分配相位编码步骤可用于使伪影最小化，甚至可提高分辨率。尽管数据采集时间短，但具有长T2的结构的信号幅度与常规二维傅里叶变换实验中的几乎相同。因此，我们的方法是一种对具有长T2的病变进行理想筛选的技术。
Based on the principles of echo imaging, we present a method to acquire sufficient data for a 256 .times. 256 image in from 2 to 40 s. The image contrast is dominated by the transverse relaxation time T2. Sampling all projections for 2D FT image reconstruction in one (or a few) echo trains leads to image artifacts due to the different T2 weighting of the echo. These artifacts cannot be described by a simple smearing out of the image in the phase direction. Proper distribution of the phase-encoding steps on the echoes can be used to minimize artifacts and even lead to resolution enhancement. In spite of the short data acquisition times, the signal amplitudes of structures with long T2 are nearly the same as those in a conventional 2D FT experiment. Our method, therefore, is an ideal screening technique for lesions with long T2.