One network no longer handles all three CT degradations: AgentCT, a vision-language agent, routes each scan to a specialist and leads PSNR across nine settings
Low-dose, sparse-view and metal-artifact CT degradations have different physics, yet universal restoration models have processed all of them with one shared architecture. AgentCT uses a LoRA-adapted Qwen3-VL-4B controller to identify degradation type and severity, dispatch the image to an image-domain diffusion denoiser or a dual-domain specialist, and re-check the restored output. On nine degradation-severity settings of patient-disjoint Mayo 2020 abdominal CT, routing with ground-truth degradation labels gave an overall PSNR/SSIM of 46.18 dB/0.984, versus 44.93 dB/0.976 for AMIR and 44.29 dB/0.979 for TAMP.