In MRI, small signal intensity changes not perceivable by naked eyes are routinely analyzed to extract valuable information, such as in fMRI. However, a small movement was difficult to detect. Recently, image amplification methods have been introduced for visualizing small sub-pixel motions that are too small to be discerned by naked eyes, based on methods developed for video processing. We use computer simulations to explore the range of parameters for the technique to work optimally.
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