核磁共振相控阵幅度图像中的信噪比测量。
Signal-to-noise measurements in magnitude images from NMR phased arrays.
作者信息
Constantinides C D, Atalar E, McVeigh E R
机构信息
Department of Biomedical Engineering, Johns-Hopkins University School of Medicine, Baltimore, Maryland, USA.
出版信息
Magn Reson Med. 1997 Nov;38(5):852-7. doi: 10.1002/mrm.1910380524.
Abstract
A method is proposed to estimate signal-to-noise ratio (SNR) values in phased array magnitude images, based on a region-of-interest (ROI) analysis. It is shown that the SNR can be found by correcting the measured signal intensity for the noise bias effects and by evaluating the noise variance as the mean square value of all the pixel intensities in a chosen background ROI, divided by twice the number of receivers used. Estimated SNR values are shown to vary spatially within a bound of 20% with respect to the true SNR values as a result of noise correlations between receivers.
摘要
提出了一种基于感兴趣区域（ROI）分析来估计相控阵幅度图像中信噪比（SNR）值的方法。结果表明，可以通过校正测量信号强度的噪声偏差效应，并将噪声方差评估为所选背景ROI中所有像素强度的均方值，再除以所用接收器数量的两倍来找到SNR。由于接收器之间的噪声相关性，估计的SNR值在空间上相对于真实SNR值在20%的范围内变化。
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