Signal‐to‐noise measurements in magnitude images from NMR phased arrays 论文
1997Magnetic Resonance in Medicine引用 505
NMR spectroscopy and applicationsAdvanced MRI Techniques and ApplicationsImage and Signal Denoising Methods
详细信息
- 发表期刊/会议
- Magnetic Resonance in Medicine
- 发表日期
- 1997-11-01
- 发表年份
- 1997
关键词
NMR spectroscopy and applicationsAdvanced MRI Techniques and ApplicationsImage and Signal Denoising Methods
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.