Contrast-to-Noise Ratio

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IQI CNR ROIs.png

CNR=|μD−μB|σB $CNR = \frac{|\mu_D-\mu_B|}{\sigma_B}$

where:

$\mu_D$ : mean pixel value of the detail ROI
$\mu_B$ : mean pixel value of the background ROI
$\sigma_B$ : standard deviation of pixel values of the background ROI

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