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. Author manuscript; available in PMC: 2021 Aug 1.
Published in final edited form as: Eur J Nucl Med Mol Imaging. 2021 Feb 1;48(9):2771–2781. doi: 10.1007/s00259-021-05197-3

FIGURE 1. The pipeline of the CNN reconstruction net.

FIGURE 1.

a). The evaluation framework of the PET reconstruction CNN. It inputs the simulated ultra-low-dose 18F-FDG PET and contrast-enhanced T1-weighted MRI images and outputs the synthetized standard-dose 18F-FDG PET images. The PET and MRI images are integrated at the mid-level after feature extraction; A skip-connection is added to the CNN in order to connect the ultra-low-dose 18F-FDG PET images with the final reconstruction. b). The calculation process of the attention-weighted loss. The attention mask highlights the tumor area.