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The standard error of computed signal standard deviation using the Walker, RMAD, and RRMAD methods with (a) one corrupted image, (b) two corrupted images, and (c) three corrupted images. The corrupted signal intensity values are set to be the original signal intensity values multiplied by the corruption factors. The different corruption factors ranging from 0.30 to 1.70 simulated different types and severity level of artifacts.
