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The filter F used for SNR enhancement. (a) M1 = 7, M2 = 3, M3 = 1. The white, light gray, and dark gray parts of the image representing the filter kernel have weights of 1, 0, and −1/40, respectively. (b) M1 = 7, M2 = 1, M3 = 1. The white and dark gray parts of the image representing the filter kernel have weights of 1 and −1/48, respectively. The pixel size of the filter kernel was 0.1 mm × 0.1 mm.
