Leung D A, Debatin J F, Wildermuth S, McKinnon G C, von Schulthess G K
Department of Radiology, Zürich University Hospital, Switzerland.
J Magn Reson Imaging. 1995 Nov-Dec;5(6):684-8. doi: 10.1002/jmri.1880050611.
We compared the cardiac image quality of multishot echo-planar imaging (EPI), segmented K-space, and conventional cine acquisitions. Three techniques were used to obtain gated multiphase acquisitions of an axial section traversing both ventricles in 10 volunteers: two-shot EPI acquired nonsequentially over two heart beats breath-held; segmented K-space cine with eight K-space lines acquired per cardiac trigger over 16 R-R intervals, also breath-held; and 24 cine phases obtained over 256 R-R intervals. Intraventricular SNRs with two-shot EPI were superior to segmented K-space cine acquisitions (P < .005) and not statistically different from conventional cine acquisitions (P < .1). Intraventricular signal was most homogeneous on conventional cine images (P < .05). Coronary artery visualization and myocardial delineation were better on the EPI image set than on segmented K-space cine images (P < .05). Two-shot EPI provides high-quality gated cardiac images with an acquisition time of only 2 seconds.
我们比较了多次激发回波平面成像（EPI）、分段K空间和传统电影采集的心脏图像质量。采用三种技术对10名志愿者进行穿过双心室的轴向层面的门控多期采集：两次激发EPI在屏气状态下分两个心动周期非顺序采集；分段K空间电影成像，每个心动触发采集8条K空间线，共16个R-R间期，同样屏气；以及在256个R-R间期内采集24个电影相位。两次激发EPI的心室内信噪比优于分段K空间电影采集（P < 0.005），与传统电影采集无统计学差异（P < 0.1）。传统电影图像上心室内信号最均匀（P < 0.05）。EPI图像组的冠状动脉显示和心肌轮廓勾画优于分段K空间电影图像（P < 0.05）。两次激发EPI仅需2秒的采集时间即可提供高质量的门控心脏图像。
