MadCLIP: Few-shot Medical Anomaly Detection with CLIP

An innovative few-shot anomaly detection approach is pre-sented, leveraging the pre-trained CLIP model for medical data, and adapting it for both image-level anomaly classification (AC) and pixel-level anomaly segmentation (AS). A dual-branch design is proposed to separately capture normal and abnormal features through learnable adapters in the CLIP vision encoder. To improve semantic alignment, learnable text prompts are employed to link visual features. Furthermore, SigLIP loss is applied to effectively handle the many-to-one relationship between images and unpaired text prompts, showcasing its adaptation in the medical field for the first time. Our approach is validated on multi-ple m odalities,demonstratingsuperiorperformanceoverexistingmeth-odsforACandAS,inbothsame-datasetandcross-datasetevaluations.Unlikepriorwork,itdoesnotrelyonsyntheticdataormemorybanks,andanablationstudyconfirmsthecontributionofeachcomponent.Thecodeisavailableathttps://github.com/mahshid1998/MadCLIP.