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The reconstruction results of the 215th slice in the test ellipsoid phantom without and with PWLS using a photon number of 104, window [0, 0.02] µm−1. The boundary indicated by the red arrow is disconnected in f U-Net, while it is reconstructed in f U-Net, PWLS. The RMSE of each image with respect to the corresponding reference with the unit 10−3 µm−1 is as follows: (a) f Reference; (b) f FBP, 3.61; (c) f FBP, PWLS, 3.45; (d) f U-Net, 1.65; and (e) f U-Net, PWLS, 1.58.
