We propose a noise analysis method based on complex MRI signals. By actively inducing concomitant fluctuation into a single complex MR image, an abrupt change in a predefined signal function (e.g. signal ratio) is observed when signal intensity becomes stronger than background noise. The method is very sensitive to the existence of weak signal such as tissue-background boundaries or very low signal tissues, and can be used to semi-quantitatively distinghuish regions of signal and noise.
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