- #1
BobP
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Homework Statement
(1) An ideal digital detector only suffers from quantum noise. If, after being exposed to 5 µGy the mean pixel value in the image is 100 and the standard deviation of the pixel values in the image is 5, calculate the SNR?
The relationship between pixel value and detector dose is linear.
(2) What is the effect on SNR of applying a linear gain of factor 4 to increase all pixel values
Homework Equations
The Attempt at a Solution
As I understand SNR = N/sqrt(N) so I would have said SNR = 10
But I don't understand why they gave the S.D value of 5...
Re part (2) I thought SNR was unaffected by gain as both noise and signal would increase by the same amount
But I am not sure about either answer.
Thanks for the help