Wetter D R, McKinnon G C, Debatin J F, von Schulthess G K
Department of Radiology, University Hospital Zurich, Switzerland.
Radiology. 1995 Mar;194(3):765-70. doi: 10.1148/radiology.194.3.7862976.
To compare the quality of cardiac images acquired with two-and four-shot echo-planar imaging (EPI) with that of images acquired with single-shot EPI.
Single-, two-, and four-shot EPI was performed to obtain axial images that traversed both cardiac ventricles. The subjects were 10 healthy men whose ages ranged from 22 to 38 years (mean, 27 years). The multiple-shot EPI data were acquired in snapshot (sequential) and cardiac-gated (non-sequential) modes. Image quality was compared by evaluation of the depiction of cardiac structures and analysis of signal intensity, contrast, and signal homogeneity.
Multiple-shot EPI depicted the coronary and internal mammary arteries better than did single-shot EPI (P < .05). Intraventricular signal intensity was more homogeneous on multiple-shot images (P < .005). Cardiac-gated acquisition resulted in less image blurring and allowed acquisition of more phases per RR interval.
Multiple-shot EPI rendered higher quality images than did single-shot EPI.
比较采用两次激发和四次激发回波平面成像（EPI）获取的心脏图像质量与单次激发EPI获取的图像质量。
采用单次、两次和四次激发EPI获取穿过两个心室的轴向图像。研究对象为10名年龄在22至38岁之间（平均27岁）的健康男性。多次激发EPI数据以快照（连续）和心脏门控（非连续）模式采集。通过评估心脏结构的显示情况以及分析信号强度、对比度和信号均匀性来比较图像质量。
多次激发EPI对冠状动脉和乳内动脉的显示优于单次激发EPI（P < .05）。多次激发图像上心室内信号强度更均匀（P < .005）。心脏门控采集导致图像模糊更少，并允许在每个RR间期采集更多相位。
多次激发EPI生成的图像质量高于单次激发EPI。
