Double-sampled echo-planar imaging at 3 tesla
Double-sampled echo-planar imaging at 3 tesla
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DOI：
10.1006/jmrb.1996.0167
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发表时间：
1996-11-01
期刊：
影响因子：
--
通讯作者：
Smith, MB
中科院分区：
文献类型：
--
作者：
Yang, QX;Posse, S;Smith, MB
回波平面成像(EPI)方法获取的图像中的一种持久伪影是Nyquist或N/2重影，它会干扰图像并降低信噪比，而Nyquist重影是奇偶回波之间时间反转不对称的结果。为了消除这一伪影，作者提出了一种双采样EPI(DSEPI)方法，其中来自每个偶数和奇数回波对的回波被等相位编码。偶数和奇数回波被分别重建成两个不同的图像，然后将它们相加在一起。DSEPI方法已经在3.0T的人脑中得到应用，证明是一种简单有效的消除奈奎斯特重影和恢复图像信噪比损失的方法。(C)1996年学术出版社。
A persistent artifact in the images acquired by the echo-planar imaging (EPI) method is the Nyquist or N/2 ghost which interferes with the image and reduces the signal-to-noise ratio (SNR), The Nyquist ghost is the result of the time-reversal asymmetry between the even and odd echoes. To eliminate this artifact, the authors present a double-sampled EPI (DSEPI) method in which echoes from each even and odd echo pair are equally phase encoded. The even and odd echoes are separately reconstructed into two distinct images which are then added together. The DSEPI method has been applied to human brain at 3.0 T and shown to be a simple and effective way to eliminate the Nyquist ghost and restore image SNR loss. (C) 1996 Academic Press, Inc.