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Groups B3 and B1 showed the lowest and highest noise levels, respectively (P 0.001). The SNR and CNR in group B3 were highest (P 0.001). The radiation dose in group B was reduced by 71.5 % on average compared to group A. Subjective scores in groups A and B2 were highest (P 0.001). Diagnostic sensitivity and confidence for liver metastases in groups A and B2 were highest (P 0.001). Reduced-dose abdominopelvic unenhanced CT combined with DL post-processing could ensure image quality and satisfy diagnostic needs. Reduce