3特斯拉下的双采样回波平面成像。
Double-sampled echo-planar imaging at 3 tesla.
作者信息
Yang Q X, Posse S, Le Bihan D, Smith M B
机构信息
Department of Radiology (Center for NMR Research), Pennsylvania State University, College of Medicine, Milton S. Hershey Medical Center, Hershey 17033, USA.
出版信息
J Magn Reson B. 1996 Nov;113(2):145-50. doi: 10.1006/jmrb.1996.0167.
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.
回波平面成像（EPI）方法采集的图像中，一个持续存在的伪影是奈奎斯特或N/2鬼影，它会干扰图像并降低信噪比（SNR）。奈奎斯特鬼影是偶数回波和奇数回波之间时间反转不对称的结果。为了消除这种伪影，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进行了同等的相位编码。偶数回波和奇数回波分别重建为两个不同的图像，然后将它们相加。DSEPI方法已应用于3.0T的人脑成像，被证明是消除奈奎斯特鬼影和恢复图像SNR损失的一种简单有效的方法。
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