磁共振成像中的噪声与滤波
Noise and filtration in magnetic resonance imaging.
作者信息
McVeigh E R, Henkelman R M, Bronskill M J
出版信息
Med Phys. 1985 Sep-Oct;12(5):586-91. doi: 10.1118/1.595679.
Abstract
Noise in two-dimensional Fourier transform magnetic resonance images has been investigated using noise power spectra and measurements of standard deviation. The measured effects of averaging, spatial filtering, temporal filtering, and sampling have been compared with theoretical calculations. The noise of unfiltered images is found to be white, as expected, and the choice of the temporal filter and sampling interval affects the noise in a manner predicted by sampling theory. The shapes of the imager's spatial frequency filters are extracted using noise power spectra.
摘要
利用噪声功率谱和标准差测量，对二维傅里叶变换磁共振图像中的噪声进行了研究。已将平均、空间滤波、时间滤波和采样的测量效果与理论计算进行了比较。正如预期的那样，未滤波图像的噪声为白噪声，并且时间滤波器和采样间隔的选择会以采样理论预测的方式影响噪声。利用噪声功率谱提取成像仪空间频率滤波器的形状。
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