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. 2022 Dec;12(12):5326–5342. doi: 10.21037/qims-22-116

Figure 8.

Figure 8

Bar plots of quality metrics’ mean and stand deviation values. Four selected evaluating indexes are PSNR, NMSE, SSIM, and CNR. The compared models are U-net, c-GAN, M-c-GAN, and the proposed bi-c-GAN. The 5% low dose PET is also used as a reference to compare in the beginning of each image. PSNR, peak signal-to-noise ratio; NMSE, normalized square error of the mean; SSIM, structural similarity; CNR, contrast noise ratio; PET, positron emission tomography; c-GAN, conditional generative adversarial network; M-c-GAN, multiple c-GAN; Bi-c-GAN, bi-task c-GAN.