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Figure 4
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 fU-Net, while it is reconstructed in fU-Net, PWLS. The RMSE of each image with respect to the corresponding reference with the unit 10−3 µm−1 is as follows: (a) fReference; (b) fFBP, 3.61; (cfFBP, PWLS, 3.45; (d) fU-Net, 1.65; and (e) fU-Net, PWLS, 1.58.

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