fig2

Figure 2. Box plot for PET and clinical data demonstrating comparison between SSL and SL; SSL significantly outperformed SL for PET_HRF and CF features, while improvements for PET_DRF were modest. PET_DRF: Deep radiomics features extracted from PET; PET_HRF: handcrafted radiomics features extracted from PET; CF: clinical features; SL: supervised learning; SSL: semi-supervised learning; MAE: mean absolute error; P: P-value; PET: positron emission tomography; HRF: handcrafted radiomics features.