Transverse image slices from the MR and the true (noiseless) PET are shown on the top. The noisy PET images and denoised PET images based on Gaussian, NLM-MR, BM4D, N2N, N2V, N2V-MR, N2V-PT, and N2V-PT-MR are shown for four different noise levels: 100M, 50M, 25M, and 12.5M counts. The cases visualized here have PSNR values close to the mean PSNR and correspond to the datapoints indicated as circles with a white fill in Figure 3.