GIBBS ARTIFACT REMOVAL IN MAGNETIC-RESONANCE-IMAGING
GIBBS ARTIFACT REMOVAL IN MAGNETIC-RESONANCE-IMAGING
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DOI：
10.1118/1.596032
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发表时间：
1987-07-01
期刊：
影响因子：
3.8
通讯作者：
FREDERICK, PR
中科院分区：
文献类型：
--
作者：
PARKER, DL;GULLBERG, GT;FREDERICK, PR
当使用带限插值时，会导致磁共振成像中的吉布斯伪影。这通常在图像的相位编码方向上的重构像素比对应的相位编码测量多时进行。这种采样实际上是一种理想的（在噪声意义上）低通滤波器，它以空间分辨率的降低为代价，提供了对比度分辨率的最大改进。在本文中，我们证明了可以使用替代低通滤波器来提高对比度分辨率，同时损失空间分辨率，但不会导致吉布斯伪影。我们表明，该滤波器的噪声性能可以通过适当地指定每个相位编码指数平均的样本数来接近理想滤波器的噪声性能。
Gibbs artifact in magnetic resonance imaging results when band‐limited interpolation is used. This is typically done when there are more reconstructed pixels in the phase encoding direction of the image than corresponding phase encoding measurements. Such sampling is effectively an ideal (in a noise sense) low‐pass filter which provides a maximal improvement in contrast resolution at the expense of a decrease in spatial resolution. In this paper we demonstrate that an alternate low‐pass filter can be used to improve contrast resolution with a loss in spatial resolution and yet not result in Gibbs artifact. We show that the noise performance of this filter can be made to approach that of an ideal filter by properly specifying the number of samples averaged for each phase encoding index.