AN UNBIASED SIGNAL-TO-NOISE RATIO MEASURE FOR MAGNETIC-RESONANCE IMAGES
AN UNBIASED SIGNAL-TO-NOISE RATIO MEASURE FOR MAGNETIC-RESONANCE IMAGES
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DOI：
10.1118/1.597004
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发表时间：
1993-07-01
期刊：
影响因子：
3.8
通讯作者：
SMITH, MR
中科院分区：
文献类型：
--
作者：
MCGIBNEY, G;SMITH, MR
低信号磁共振（MR）图像的真实信噪比（SNR）估计受到数据幅度表示的干扰。本文提出了一个简单的解决这个问题的方法。测量SNR的常用方法是将平均信号与噪声的标准偏差进行比较。由于噪声偏置，发现这种SNR测量对于高信噪比图像区域是令人满意的，但对于低信噪比图像区域不是。这些不一致性被删除，通过引入无偏定义的信号和噪声水平的均方根值。通过评价MR医学图像的SNR值，比较了这些方法。
Estimating the true signal-to-noise ratio (SNR) of magnetic resonance (MR) images with low signal is confounded by the magnitude presentation of the data. This paper suggests a simple solution to this problem. A common method of measuring SNR compares the mean signal to the standard deviation of the noise. This SNR measure was found to be satisfactory for high but not low signal-to-noise image regions because of noise bias. These inconsistencies are removed by introducing unbiased definitions of the signal and noise levels in terms of their root-mean-square values. The approaches are compared by evaluating the SNR values for MR medical images.