Signal-to-noise measurements in magnitude images from NMR phased arrays

被引：407
作者：
Constantinides, CD [1 ]
Atalar, E [1 ]
McVeigh, ER [1 ]
机构：
[1] JOHNS HOPKINS UNIV,SCH MED,DEPT BIOMED ENGN,BALTIMORE,MD 21287
来源：
MAGNETIC RESONANCE IN MEDICINE | 1997年 / 38卷 / 05期
关键词：
phased array coils; noise correlations; signal-to-noise;
D O I：
10.1002/mrm.1910380524
中图分类号：
R8 [特种医学]; R445 [影像诊断学];
学科分类号：
1002 ; 100207 ; 1009 ;
摘要：
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.
引用
收藏
页码：852 / 857
页数：6
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