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CT-Agent: A Multimodal-LLM Agent for 3D CT Radiology Question Answering

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arxiv 2505.16229 v1 pith:2YEE6EV3 submitted 2025-05-22 cs.CV

CT-Agent: A Multimodal-LLM Agent for 3D CT Radiology Question Answering

classification cs.CV
keywords ct-agentradiologyansweringquestionanatomicanatomicalcomplexityctqa
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Computed Tomography (CT) scan, which produces 3D volumetric medical data that can be viewed as hundreds of cross-sectional images (a.k.a. slices), provides detailed anatomical information for diagnosis. For radiologists, creating CT radiology reports is time-consuming and error-prone. A visual question answering (VQA) system that can answer radiologists' questions about some anatomical regions on the CT scan and even automatically generate a radiology report is urgently needed. However, existing VQA systems cannot adequately handle the CT radiology question answering (CTQA) task for: (1) anatomic complexity makes CT images difficult to understand; (2) spatial relationship across hundreds slices is difficult to capture. To address these issues, this paper proposes CT-Agent, a multimodal agentic framework for CTQA. CT-Agent adopts anatomically independent tools to break down the anatomic complexity; furthermore, it efficiently captures the across-slice spatial relationship with a global-local token compression strategy. Experimental results on two 3D chest CT datasets, CT-RATE and RadGenome-ChestCT, verify the superior performance of CT-Agent.

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Cited by 10 Pith papers

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