How to calculate Signal to noise ratio for a CT scan image?

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Krishna Pavan 2020-4-8

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回答： Rahul 2024-12-6，6:54

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Answer 1

Rahul 2024-12-6，6:54

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Hi @Krishna Pavan,

In order to obtain the Signal to Noise ratio (SNR) of the given CT scan image, consider using the following formula for SNR

SNR = 10*log10(signal/noise)
Here 'signal' can be considered as the mean of the pixel values of the CT Scan image.
Here 'noise' can be considered as the standard deviation of the pixel values of the CT Scan image.

Here is an example:

% Considering 'img' to be the variable containing CT scan image data
signal = mean(double(img(:)));
noise = std(double(img(:)));
SNR = 10*log10(signal/noise);

The following MATLAB Answers also mentions similar approaches:

https://www.mathworks.com/matlabcentral/answers/57152-snr-of-an-image

https://www.mathworks.com/matlabcentral/answers/55649-how-to-calculate-actual-snr-of-image-in-matlab

The following MathWorks documentations can be referred to know more:

'mean': https://www-test1.mathworks.com/help/releases/R2018b/matlab/ref/mean.html

'std': https://www-test1.mathworks.com/help/releases/R2018b/matlab/ref/std.html

Thanks.