NVIDIA releases NV-Reason-CT — open 3D CT VLM with radiologist-style chain-of-thought
NVIDIA introduced NV-Reason-CT, an open research 3D vision-language model that combines a full 3D vision transformer encoder with a Qwen3.5-4B language model trained to generate radiologist-style chain-of-thought reasoning and structured reports for chest and abdominal CT. The model reports state-of-the-art results on the CT-RATE benchmark (Macro-F1 0.614, Macro-AUROC 0.871), was judged clinically plausible by NIH radiologists, and is offered as a foundation for post-training and integration with NVIDIA Medical AI tools (segmentation, synthetic data).