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Second and fourth rows show zoomed regions-of-interests marked with red rectangles in the images of the first and third rows. VIGAN achieves the lowest image noise (i.e., standard deviation(SD)) compared to Cycle-GAN and original LDCT. WL/WW = 115/250 for original LDCT. WL/WW = 85/250 for Cycle-GAN and VIGAN.
